docs(website): use .mdx extension for every docs (#8490)

website/versioned_docs/version-2.0.1/api/plugins/overview.mdx

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+---
+sidebar_position: 0
+id: plugins-overview
+sidebar_label: Plugins overview
+slug: /api/plugins
+---
+
+# Docusaurus plugins
+
+We provide official Docusaurus plugins.
+
+## Content plugins {#content-plugins}
+
+These plugins are responsible for loading your site's content, and creating pages for your theme to render.
+
+- [@docusaurus/plugin-content-docs](./plugin-content-docs.mdx)
+- [@docusaurus/plugin-content-blog](./plugin-content-blog.mdx)
+- [@docusaurus/plugin-content-pages](./plugin-content-pages.mdx)
+
+## Behavior plugins {#behavior-plugins}
+
+These plugins will add a useful behavior to your Docusaurus site.
+
+- [@docusaurus/plugin-debug](./plugin-debug.mdx)
+- [@docusaurus/plugin-sitemap](./plugin-sitemap.mdx)
+- [@docusaurus/plugin-pwa](./plugin-pwa.mdx)
+- [@docusaurus/plugin-client-redirects](./plugin-client-redirects.mdx)
+- [@docusaurus/plugin-ideal-image](./plugin-ideal-image.mdx)
+- [@docusaurus/plugin-google-analytics](./plugin-google-analytics.mdx)
+- [@docusaurus/plugin-google-gtag](./plugin-google-gtag.mdx)