Improve SEO for Index + Quickstart Pages (#742)

# Summary

SEO guided towards some refinements of the H1s on the index and
quickstart pages

source/default-conf.py

@@ -277,6 +277,8 @@ intersphinx_mapping = {
 
 rst_prolog = """
 
+.. |platform| replace:: %s
+
 .. |podman| replace:: `Podman <https://podman.io/>`__
 
 .. |kes-tag| replace:: `KESLATEST <https://github.com/minio/kes/releases/tag/KESLATEST>`__
@@ -305,4 +307,4 @@ rst_prolog = """
 .. |rust-sdk-version| replace:: RUSTVERSION
 
 
-"""
+""" % platform_fmt

source/includes/k8s/quickstart.rst

@@ -1,8 +1,8 @@
 .. _quickstart-kubernetes:
 
-=========================
+================================
-Quickstart for Kubernetes
+Quickstart: MinIO for Kubernetes
-=========================
+================================
 
 .. default-domain:: minio
 

source/includes/linux/quickstart.rst

@@ -1,8 +1,8 @@
 .. _quickstart-linux:
 
-====================
+===========================
-Quickstart for Linux
+Quickstart: MinIO for Linux
-====================
+===========================
 
 .. default-domain:: minio
 

source/includes/macos/quickstart.rst

@@ -1,8 +1,8 @@
 .. _quickstart-macos:
 
-=======================
+=============================
-Quickstart for Mac OSX
+Quickstart: MinIO for Mac OSX
-=======================
+=============================
 
 .. default-domain:: minio
 

source/includes/windows/quickstart.rst

@@ -1,8 +1,8 @@
 .. _quickstart-windows:
 
-======================
+=============================
-Quickstart for Windows
+Quickstart: MinIO for Windows
-======================
+=============================
 
 .. default-domain:: minio
 

source/index.rst

@@ -1,6 +1,6 @@
-=====================================
+================================================================================
-MinIO High Performance Object Storage
+MinIO Object Storage for |platform|
-=====================================
+================================================================================
 
 .. default-domain:: minio
 
@@ -16,7 +16,7 @@ MinIO High Performance Object Storage
    
    - `How to Connect to MinIO with JavaScript <https://www.youtube.com/watch?v=yUR4Fvx0D3E&list=PLFOIsHSSYIK3Dd3Y_x7itJT1NUKT5SxDh&index=5>`__
 
-MinIO is a high performance object storage solution that provides an Amazon Web Services S3-compatible API and supports all core S3 features. 
+MinIO is an object storage solution that provides an Amazon Web Services S3-compatible API and supports all core S3 features. 
 MinIO is built to deploy anywhere - public or private cloud, baremetal infrastructure, orchestrated environments, and edge infrastructure.
 
 .. cond:: linux