chore(v2): prepare v2.0.0-beta.0 release (#4774)

* beta.0 version docs + changelog

* fix config for beta switch

* v2.0.0-beta.0

website/versioned_docs/version-2.0.0-beta.0/api/plugins/plugin-content-pages.md

@@ -0,0 +1,89 @@
+---
+id: plugin-content-pages
+title: '📦 plugin-content-pages'
+slug: '/api/plugins/@docusaurus/plugin-content-pages'
+---
+
+The default pages plugin for Docusaurus. The classic template ships with this plugin with default configurations. This plugin provides [creating pages](guides/creating-pages.md) functionality.
+
+## Installation {#installation}
+
+```bash npm2yarn
+npm install --save @docusaurus/plugin-content-pages
+```
+
+:::tip
+
+If you have installed `@docusaurus/preset-classic`, you don't need to install it as a dependency. You can also configure it through the [classic preset options](presets.md#docusauruspreset-classic) instead of doing it like below.
+
+:::
+
+## Configuration {#configuration}
+
+```js title="docusaurus.config.js"
+module.exports = {
+  plugins: [
+    [
+      '@docusaurus/plugin-content-pages',
+      {
+        /**
+         * Path to data on filesystem
+         * relative to site dir
+         * components in this directory will be automatically converted to pages
+         */
+        path: 'src/pages',
+        /**
+         * URL route for the page section of your site
+         * do not include trailing slash
+         */
+        routeBasePath: '',
+        include: ['**/*.{js,jsx,ts,tsx,md,mdx}'],
+        /**
+         * No Route will be created for matching files
+         */
+        exclude: [
+          '**/_*.{js,jsx,ts,tsx,md,mdx}',
+          '**/*.test.{js,ts}',
+          '**/__tests__/**',
+        ],
+        /**
+         * Theme component used by markdown pages.
+         */
+        mdxPageComponent: '@theme/MDXPage',
+        /**
+         * Remark and Rehype plugins passed to MDX
+         */
+        remarkPlugins: [],
+        rehypePlugins: [],
+        /**
+         * Custom Remark and Rehype plugins passed to MDX before
+         * the default Docusaurus Remark and Rehype plugins.
+         */
+        beforeDefaultRemarkPlugins: [],
+        beforeDefaultRehypePlugins: [],
+      },
+    ],
+  ],
+};
+```
+
+## i18n {#i18n}
+
+Read the [i18n introduction](../../i18n/i18n-introduction.md) first.
+
+### Translation files location {#translation-files-location}
+
+- **Base path**: `website/i18n/<locale>/docusaurus-plugin-content-pages`
+- **Multi-instance path**: `website/i18n/<locale>/docusaurus-plugin-content-pages-<pluginId>`
+- **JSON files**: extracted with [`docusaurus write-translations`](../../cli.md#docusaurus-write-translations)
+- **Markdown files**: `website/i18n/<locale>/docusaurus-plugin-content-pages`
+
+### Example file-system structure {#example-file-system-structure}
+
+```bash
+website/i18n/<locale>/docusaurus-plugin-content-pages
+│
+│ # translations for website/src/pages
+├── first-markdown-page.md
+└── second-markdown-page.md
+```