release v1.6 docs

* release docs for v1.6

* improve changelog

* remove v0.3.0 version

Author: AyushBherwani1998

docusaurus.config.js

@@ -269,7 +269,7 @@ const config = {
         sidebarCollapsed: false,
         includeCurrentVersion: true,
         // Set to the latest release.
-        lastVersion: '1.5.0',
+        lastVersion: '1.6.0',
         versions: {
           // Defaults to the ./docs folder.
           // Using "development" instead of "next" as path.
@@ -278,8 +278,8 @@ const config = {
             path: 'development',
           },
           // The latest release.
-          '1.5.0': {
-            label: 'latest (1.5.0)',
+          '1.6.0': {
+            label: 'latest (1.6.0)',
           },
         },
       },