Replace Algolia DocSearch with InstantSearch (#621)

- Rendered only the relevant search results that has the match-level of
either `full` or `partial`.
- Added refinements to display results from other platforms (Active
platform is selected by default).
- Better title and hierarchical display.

![title](https://user-images.githubusercontent.com/13393018/198229684-3018b591-a54c-4b4f-80db-94c11e33ec65.svg)


- Added icons to represent the hierarchy level.

![icons](https://user-images.githubusercontent.com/13393018/198228150-143153bf-aa9a-4c41-baf8-bd9fa3d33bf2.png)
- Relevant results on full/partial match queries.
<img width="595" alt="Screenshot 2022-10-27 at 12 09 26"
src="https://user-images.githubusercontent.com/13393018/198228440-3a7b52a6-9f33-4778-a2ab-15b1454ede99.png">

- TODO: Keyboard shortcut to trigger/focus the search modal. (Will
address this with a new PR)

source/_static/js/main.js

@@ -350,39 +350,6 @@ window.addEventListener("DOMContentLoaded", (event) => {
     }
   })();
 
-  // --------------------------------------------------
-  // Search
-  // --------------------------------------------------
-  (function () {
-    const docSearchEl = document.getElementById("docsearch");
-    const platform = document.head.querySelector('meta[name="docsearch:platform"]').content
-
-    if(docSearchEl) {
-      // Init Docsearch
-      docsearch({
-        container: '#docsearch',
-        appId: 'E1CSOK3UC2',
-        indexName: 'minio',
-        apiKey: '6bc246d81fd3b79f51cf88f0b2481bac',
-        placeholder: 'Search Documentation',
-        searchParameters: {
-          facetFilters: ['platform:' + platform]
-        }
-      });
-
-      // Trigger Docsearch modal on custom button clicks
-      const searchToggleEls = document.querySelectorAll(".search-toggle");
-      const docSearchBtn = document.querySelector(".DocSearch-Button");
-
-      searchToggleEls.forEach(item => {
-        item.addEventListener("click", (event) => {
-          event.preventDefault();
-          docSearchBtn.click();
-        });
-      });
-    }
-  })();
-
   // --------------------------------------------------
   // Custom scrollbars for `pre` code blocks
   // --------------------------------------------------