chore: prepare v2.0.0-beta.20 release (#7347)

website/versioned_docs/version-2.0.0-beta.20/api/themes/_category_.yml

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+label: Themes
+position: 3
+link:
+  type: doc
+  id: themes-overview # Dogfood using a "local id"

website/versioned_docs/version-2.0.0-beta.20/api/themes/overview.md

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+---
+sidebar_position: 0
+id: themes-overview
+title: 'Docusaurus themes'
+sidebar_label: Themes overview
+slug: '/api/themes'
+---
+
+We provide official Docusaurus themes.
+
+## Main themes {#main-themes}
+
+The main themes implement the user interface for the [docs](../plugins/plugin-content-docs.md), [blog](../plugins/plugin-content-blog.md) and [pages](../plugins/plugin-content-pages.md) plugins.
+
+- [@docusaurus/theme-classic](./theme-classic.md)
+- 🚧 other themes are planned
+
+:::caution
+
+The goal is to have all themes share the exact same features, user-experience and configuration.
+
+Only the UI design and underlying styling framework should change, and you should be able to change theme easily.
+
+We are not there yet: only the classic theme is production ready.
+
+:::
+
+## Enhancement themes {#enhancement-themes}
+
+These themes will enhance the existing main themes with additional user-interface related features.
+
+- [@docusaurus/theme-live-codeblock](./theme-live-codeblock.md)
+- [@docusaurus/theme-search-algolia](./theme-search-algolia.md)

website/versioned_docs/version-2.0.0-beta.20/api/themes/theme-classic.md

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+---
+sidebar_position: 2
+id: theme-classic
+title: '📦 theme-classic'
+slug: '/api/themes/@docusaurus/theme-classic'
+---
+
+The classic theme for Docusaurus.
+
+You can refer to the [theme configuration page](theme-configuration.md) for more details on the configuration.
+
+```bash npm2yarn
+npm install --save @docusaurus/theme-classic
+```
+
+:::tip
+
+If you have installed `@docusaurus/preset-classic`, you don't need to install it as a dependency.
+
+:::

website/versioned_docs/version-2.0.0-beta.20/api/themes/theme-live-codeblock.md

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+---
+sidebar_position: 3
+id: theme-live-codeblock
+title: '📦 theme-live-codeblock'
+slug: '/api/themes/@docusaurus/theme-live-codeblock'
+---
+
+This theme provides a `@theme/CodeBlock` component that is powered by react-live. You can read more on [interactive code editor](../../guides/markdown-features/markdown-features-code-blocks.mdx#interactive-code-editor) documentation.
+
+```bash npm2yarn
+npm install --save @docusaurus/theme-live-codeblock
+```
+
+### Configuration {#configuration}
+
+```js title="docusaurus.config.js"
+module.exports = {
+  plugins: ['@docusaurus/theme-live-codeblock'],
+  themeConfig: {
+    liveCodeBlock: {
+      /**
+       * The position of the live playground, above or under the editor
+       * Possible values: "top" | "bottom"
+       */
+      playgroundPosition: 'bottom',
+    },
+  },
+};
+```

website/versioned_docs/version-2.0.0-beta.20/api/themes/theme-search-algolia.md

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+---
+sidebar_position: 4
+id: theme-search-algolia
+title: '📦 theme-search-algolia'
+slug: '/api/themes/@docusaurus/theme-search-algolia'
+---
+
+This theme provides a `@theme/SearchBar` component that integrates with Algolia DocSearch easily. Combined with `@docusaurus/theme-classic`, it provides a very easy search integration. You can read more on [search](../../search.md) documentation.
+
+```bash npm2yarn
+npm install --save @docusaurus/theme-search-algolia
+```
+
+This theme also adds search page available at `/search` (as swizzlable `SearchPage` component) path with OpenSearch support. You can this default path via `themeConfig.algolia.searchPagePath`. Use `false` to disable search page.
+
+:::tip
+
+If you have installed `@docusaurus/preset-classic`, you don't need to install it as a dependency.
+
+:::