Simplify documentation and configuration file CI system

Now that the parser tool is moved out of the repository, it makes less sense to use the taskfile-based approach for the
CI infrastructure. In order to make the repository more contributor-friendly, the documentation and configuration
checking system is now confined to the .github subfolder.

.github/.markdown-link-check.json

@@ -0,0 +1,5 @@
+{
+  "retryOn429": true,
+  "retryCount": 3,
+  "aliveStatusCodes": [200, 206]
+}

.github/.markdownlint.yml

@@ -0,0 +1,61 @@
+# See: https://github.com/DavidAnson/markdownlint/blob/main/doc/Rules.md
+# The code style defined in this file is the official standardized style to be used in all Arduino projects and should
+# not be modified.
+# Note: Rules disabled solely because they are redundant to Prettier are marked with a "Prettier" comment.
+
+default: false
+MD001: false
+MD002: false
+MD003: false # Prettier
+MD004: false # Prettier
+MD005: false # Prettier
+MD006: false # Prettier
+MD007: false # Prettier
+MD008: false # Prettier
+MD009:
+  br_spaces: 0
+  strict: true
+  list_item_empty_lines: false # Prettier
+MD010: false # Prettier
+MD011: true
+MD012: false # Prettier
+MD013: false
+MD014: false
+MD018: true
+MD019: false # Prettier
+MD020: true
+MD021: false # Prettier
+MD022: false # Prettier
+MD023: false # Prettier
+MD024: false
+MD025:
+  level: 1
+  front_matter_title: '^\s*"?title"?\s*[:=]'
+MD026: false
+MD027: false # Prettier
+MD028: false
+MD029:
+  style: one
+MD030:
+  ul_single: 1
+  ol_single: 1
+  ul_multi: 1
+  ol_multi: 1
+MD031: false # Prettier
+MD032: false # Prettier
+MD033: false
+MD034: false
+MD035: false # Prettier
+MD036: false
+MD037: true
+MD038: true
+MD039: true
+MD040: false
+MD041: false
+MD042: true
+MD043: false
+MD044: false
+MD045: true
+MD046:
+  style: fenced
+MD047: false # Prettier

.github/workflows/check-config.yml

@@ -1,38 +0,0 @@
-name: Check configuration files
-
-on:
-  push:
-    paths:
-      - ".github/workflows/check-config.yml"
-      - "Taskfile.yml"
-      - "**.yml"
-      - "**.yaml"
-      - "**.json"
-  pull_request:
-    paths:
-      - ".github/workflows/check-config.yml"
-      - "Taskfile.yml"
-      - "**.yml"
-      - "**.yaml"
-      - "**.json"
-  # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#workflow_dispatch
-  workflow_dispatch:
-  # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#repository_dispatch
-  repository_dispatch:
-
-jobs:
-  check:
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout local repository
-        uses: actions/checkout@v2
-
-      - name: Install Taskfile
-        uses: arduino/actions/setup-taskfile@master
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          version: 3.x
-
-      - name: Check formatting
-        run: task config:check-formatting

.github/workflows/check-docs.yml

@@ -1,37 +0,0 @@
-name: Check documentation files
-
-on:
-  push:
-    paths:
-      - ".github/workflows/check-docs.yml"
-      - "Taskfile.yml"
-      - "**.md"
-  pull_request:
-    paths:
-      - ".github/workflows/check-docs.yml"
-      - "Taskfile.yml"
-      - "**.md"
-  # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#workflow_dispatch
-  workflow_dispatch:
-  # See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows#repository_dispatch
-  repository_dispatch:
-
-jobs:
-  check:
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout local repository
-        uses: actions/checkout@v2
-
-      - name: Install Taskfile
-        uses: arduino/actions/setup-taskfile@master
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          version: 3.x
-
-      - name: Check links
-        run: task docs:check-links
-
-      - name: Check formatting
-        run: task docs:check-formatting

.github/workflows/check-markdown.yml

@@ -0,0 +1,67 @@
+name: Check Markdown
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-markdown.yml"
+      - ".github/.markdown-link-check.json"
+      - "**/.markdownlint*"
+      - "**.md"
+      - "**.mdx"
+      - "**.mkdn"
+      - "**.mdown"
+      - "**.markdown"
+  pull_request:
+    paths:
+      - ".github/workflows/check-markdown.yml"
+      - ".github/.markdown-link-check.json"
+      - "**/.markdownlint*"
+      - "**.md"
+      - "**.mdx"
+      - "**.mkdn"
+      - "**.mdown"
+      - "**.markdown"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to markdownlint.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Initialize markdownlint-cli problem matcher
+        uses: xt0rted/markdownlint-problem-matcher@v1
+
+      - name: Install markdownlint-cli
+        run: sudo npm install --global markdownlint-cli
+
+      - name: Run markdownlint
+        run: markdownlint --config "${{ github.workspace }}/.github/.markdownlint.yml" "**/*.md"
+
+  links:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Determine whether only modified files should be checked
+        id: check-modified
+        if: github.event_name == 'pull_request'
+        run: |
+          echo "::set-output name=value::yes"
+
+      - name: Check links
+        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          config-file: .github/.markdown-link-check.json
+          use-quiet-mode: "yes"
+          check-modified-files-only: ${{ steps.check-modified.outputs.value }}
+          base-branch: ${{ github.base_ref }}

.github/workflows/check-prettier-formatting.yml

@@ -0,0 +1,224 @@
+name: Check Prettier Formatting
+
+# See: https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-prettier-formatting.yml"
+      - "**/.prettierignore"
+      - "**/.prettierrc*"
+      # CSS
+      - "**.css"
+      - "**.wxss"
+      # PostCSS
+      - "**.pcss"
+      - "**.postcss"
+      # Less
+      - "**.less"
+      # SCSS
+      - "**.scss"
+      # GraphQL
+      - "**.graphqls?"
+      - "**.gql"
+      # handlebars
+      - "**.handlebars"
+      - "**.hbs"
+      # HTML
+      - "**.mjml"
+      - "**.html?"
+      - "**.html.hl"
+      - "**.st"
+      - "**.xht"
+      - "**.xhtml"
+      # Vue
+      - "**.vue"
+      # JavaScript
+      - "**.flow"
+      - "**._?jsb?"
+      - "**.bones"
+      - "**.cjs"
+      - "**.es6?"
+      - "**.frag"
+      - "**.gs"
+      - "**.jake"
+      - "**.jscad"
+      - "**.jsfl"
+      - "**.js[ms]"
+      - "**.[mn]js"
+      - "**.pac"
+      - "**.wxs"
+      - "**.[xs]s?js"
+      - "**.xsjslib"
+      # JSX
+      - "**.jsx"
+      # TypeScript
+      - "**.ts"
+      # TSX
+      - "**.tsx"
+      # JSON
+      - "**/.eslintrc"
+      - "**.json"
+      - "**.avsc"
+      - "**.geojson"
+      - "**.gltf"
+      - "**.har"
+      - "**.ice"
+      - "**.JSON-tmLanguage"
+      - "**.mcmeta"
+      - "**.tfstate"
+      - "**.topojson"
+      - "**.webapp"
+      - "**.webmanifest"
+      - "**.yyp?"
+      # JSONC
+      - "**/.babelrc"
+      - "**/.jscsrc"
+      - "**/.js[hl]intrc"
+      - "**.jsonc"
+      - "**.sublime-*"
+      # JSON5
+      - "**.json5"
+      # Markdown
+      - "**.mdx?"
+      - "**.markdown"
+      - "**.mk?down"
+      - "**.mdwn"
+      - "**.mkdn?"
+      - "**.ronn"
+      - "**.workbook"
+      # YAML
+      - "**/.clang-format"
+      - "**/.clang-tidy"
+      - "**/.gemrc"
+      - "**/glide.lock"
+      - "**.yml"
+      - "**.mir"
+      - "**.reek"
+      - "**.rviz"
+      - "**.sublime-syntax"
+      - "**.syntax"
+      - "**.yaml"
+      - "**.yaml-tmlanguage"
+      - "**.yaml.sed"
+      - "**.yml.mysql"
+  pull_request:
+    paths:
+      - ".github/workflows/check-prettier-formatting.yml"
+      - "**/.prettierignore"
+      - "**/.prettierrc*"
+      # CSS
+      - "**.css"
+      - "**.wxss"
+      # PostCSS
+      - "**.pcss"
+      - "**.postcss"
+      # Less
+      - "**.less"
+      # SCSS
+      - "**.scss"
+      # GraphQL
+      - "**.graphqls?"
+      - "**.gql"
+      # handlebars
+      - "**.handlebars"
+      - "**.hbs"
+      # HTML
+      - "**.mjml"
+      - "**.html?"
+      - "**.html.hl"
+      - "**.st"
+      - "**.xht"
+      - "**.xhtml"
+      # Vue
+      - "**.vue"
+      # JavaScript
+      - "**.flow"
+      - "**._?jsb?"
+      - "**.bones"
+      - "**.cjs"
+      - "**.es6?"
+      - "**.frag"
+      - "**.gs"
+      - "**.jake"
+      - "**.jscad"
+      - "**.jsfl"
+      - "**.js[ms]"
+      - "**.[mn]js"
+      - "**.pac"
+      - "**.wxs"
+      - "**.[xs]s?js"
+      - "**.xsjslib"
+      # JSX
+      - "**.jsx"
+      # TypeScript
+      - "**.ts"
+      # TSX
+      - "**.tsx"
+      # JSON
+      - "**/.eslintrc"
+      - "**.json"
+      - "**.avsc"
+      - "**.geojson"
+      - "**.gltf"
+      - "**.har"
+      - "**.ice"
+      - "**.JSON-tmLanguage"
+      - "**.mcmeta"
+      - "**.tfstate"
+      - "**.topojson"
+      - "**.webapp"
+      - "**.webmanifest"
+      - "**.yyp?"
+      # JSONC
+      - "**/.babelrc"
+      - "**/.jscsrc"
+      - "**/.js[hl]intrc"
+      - "**.jsonc"
+      - "**.sublime-*"
+      # JSON5
+      - "**.json5"
+      # Markdown
+      - "**.mdx?"
+      - "**.markdown"
+      - "**.mk?down"
+      - "**.mdwn"
+      - "**.mkdn?"
+      - "**.ronn"
+      - "**.workbook"
+      # YAML
+      - "**/.clang-format"
+      - "**/.clang-tidy"
+      - "**/.gemrc"
+      - "**/glide.lock"
+      - "**.yml"
+      - "**.mir"
+      - "**.reek"
+      - "**.rviz"
+      - "**.sublime-syntax"
+      - "**.syntax"
+      - "**.yaml"
+      - "**.yaml-tmlanguage"
+      - "**.yaml.sed"
+      - "**.yml.mysql"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage caused by changes to Prettier.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Prettier
+        run: sudo npm install --global prettier
+
+      - name: Format with Prettier
+        run: prettier --write .
+
+      - name: Check formatting
+        run: git diff --color --exit-code

.prettierrc

@@ -1,12 +0,0 @@
-{
-  "semi": false,
-  "printWidth": 120,
-  "overrides": [
-    {
-      "files": "*.md",
-      "options": {
-        "proseWrap": "always"
-      }
-    }
-  ]
-}

Taskfile.yml

@@ -1,16 +1,6 @@
 version: "3"
 
-vars:
-  PRETTIER: prettier@2.1.2
-
 tasks:
-  docs:check:
-    desc: Lint and check formatting of documentation files
-    deps:
-      - task: docs:check-license
-      - task: docs:check-links
-      - task: docs:check-formatting
-
   docs:check-license:
     desc: Check if the license file is correctly formatted
     cmds:
@@ -35,41 +25,3 @@ tasks:
           exit 1
         fi
 
-  docs:check-links:
-    desc: Check for dead links in documentation
-    cmds:
-      - |
-        npx --package markdown-link-check --call '
-        STATUS=0
-        for file in $(find -name "*.md"); do
-          markdown-link-check --quiet "$file"
-          STATUS=$(( $STATUS + $? ))
-        done
-        exit $STATUS'
-
-  docs:check-formatting:
-    desc: Check formatting of documentation files
-    cmds:
-      - npx {{.PRETTIER}} --check "**/*.md"
-
-
-  config:check:
-    desc: Lint and check formatting of configuration files
-    deps:
-      - task: config:check-formatting
-
-  config:check-formatting:
-    desc: Check formatting of configuration files
-    cmds:
-      - npx {{.PRETTIER}} --check "**/*.{yml,yaml,json}"
-
-  docs:format:
-    desc: Format documentation files
-    cmds:
-      - npx {{.PRETTIER}} --write "**/*.md"
-
-  config:format:
-    desc: Format configuration files
-    cmds:
-      - npx {{.PRETTIER}} --write "**/*.{yml,yaml,json}"
-