chore: rename v2.docusaurus.io urls after domain switch + redirect + cleanups (#4490)

* prepare v1-v2 domain switch

* rename v1 changelog as CHANGELOG-1.x.md

* switch v1/v2 changelogs

* Cleanup v2.docusaurus.io urls

* add netlify domain redirect

* remove circleci config

* remove another circle file

website/docs/api/docusaurus.config.js.md

@@ -31,7 +31,7 @@ URL for site favicon. Example:
 
 ```js title="docusaurus.config.js"
 module.exports = {
-  favicon: 'https://v2.docusaurus.io/favicon.ico',
+  favicon: 'https://docusaurus.io/favicon.ico',
 };
 ```
 

website/docs/api/plugins/plugin-debug.md

@@ -12,7 +12,7 @@ It is mostly useful for plugin authors, that will be able to inspect more easily
 
 If you report a bug, we will probably ask you to have this plugin turned on in the production, so that we can inspect your deployment config more easily.
 
-If you don't have any sensitive information, you can keep it on in production [like we do](http://v2.docusaurus.io/__docusaurus/debug).
+If you don't have any sensitive information, you can keep it on in production [like we do](http://docusaurus.io/__docusaurus/debug).
 
 :::
 

website/docs/api/themes/theme-configuration.md

@@ -193,7 +193,7 @@ module.exports = {
         alt: 'Site Logo',
         src: 'img/logo.svg',
         srcDark: 'img/logo_dark.svg', // Default to `logo.src`.
-        href: 'https://v2.docusaurus.io/', // Default to `siteConfig.baseUrl`.
+        href: 'https://docusaurus.io/', // Default to `siteConfig.baseUrl`.
         target: '_self', // By default, this value is calculated based on the `href` attribute (the external link will open in a new tab, all others in the current one).
       },
     },