chore(v2): prepare v2.0.0-beta.2 release (#5056)

* prepare beta.2

* v2.0.0-beta.2

website/versioned_docs/version-2.0.0-beta.2/api/plugins/overview.md

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