docs: document remaining extensions (remirror#1141)

docs/extensions/code-block-extension.md

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+---
+hide_title: true
+title: 'CodeBlockExtension'
+---
+
+# `CodeBlockExtension`
+
+## Summary
+
+Adds code blocks to the editor. This differs to the `CodeExtension`, which provides code marks on inline text.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { CodeBlockExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-code-block` package. There are two ways of pulling it into your project.
+
+### Examples
+
+See [storybook](https://remirror.vercel.app/?path=/story/extensions-codeblock--basic) for examples.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/collaboration-extension.md

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+---
+hide_title: true
+title: 'CollaborationExtension'
+---
+
+# `CollaborationExtension`
+
+## Summary
+
+The collaboration extension adds collaborative functionality to your editor.
+
+Once a central server is created the collaboration extension is good.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { CollaborationExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-collaboration` package. There are two ways of pulling it into your project.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/columns-extension.md

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+---
+hide_title: true
+title: 'ColumnsExtension'
+---
+
+# `ColumnsExtension`
+
+## Summary
+
+Add column support to the nodes in your editor.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { ColumnsExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-columns` package. There are two ways of pulling it into your project.
+
+### Examples
+
+See [storybook](https://remirror.vercel.app/?path=/story/extensions-columns--basic) for examples.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/drop-cursor-extension.md

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+---
+hide_title: true
+title: 'DropCursorExtension'
+---
+
+# `DropCursorExtension`
+
+## Summary
+
+Shows a line indicator for where the drop target will be
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { DropCursorExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-drop-cursor` package. There are two ways of pulling it into your project.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/emoji-extension.md

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+---
+hide_title: true
+title: 'EmojiExtension'
+---
+
+# `EmojiExtension`
+
+## Summary
+
+Adds emoji support to the editor.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { EmojiExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-emoji` package. There are two ways of pulling it into your project.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/epic-mode-extension.md

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+---
+hide_title: true
+title: 'EpicModeExtension'
+---
+
+# `EpicModeExtension`
+
+## Summary
+
+Shows the editor in epic mode.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { EpicModeExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-epicmode` package. There are two ways of pulling it into your project.
+
+### Examples
+
+See [storybook](https://remirror.vercel.app/?path=/story/extensions-epicmode--basic) for examples.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/events-extension.md

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+---
+hide_title: true
+title: 'EventsExtension'
+---
+
+# `EventsExtension`
+
+## Summary
+
+The events extension which listens to events which occur within the remirror editor.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { EventsExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-events` package. There are two ways of pulling it into your project.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/file-extension.md

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+---
+hide_title: true
+title: 'FileExtension'
+---
+
+# `FileExtension`
+
+## Summary
+
+Adds a file node to the editor
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { FileExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-file` package. There are two ways of pulling it into your project.
+
+### Examples
+
+See [storybook](https://remirror.vercel.app/?path=/story/extensions-file--basic) for examples.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/gap-cursor-extension.md

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+---
+hide_title: true
+title: 'GapCursorExtension'
+---
+
+# `GapCursorExtension`
+
+## Summary
+
+this will capture clicks near and arrow-key-motion past places that don't have a normally selectable position nearby, and create a gap cursor selection for them. The cursor is drawn as an element with class `ProseMirror-gapcursor`.
+
+Make sure to import the styles:
+
+```ts
+import '@remirror/styles/extension-gap-cursor.css';
+```
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { GapCursorExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-gap-cursor` package. There are two ways of pulling it into your project.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers

docs/extensions/hard-break-extension.md

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+---
+hide_title: true
+title: 'HardBreakExtension'
+---
+
+# `HardBreakExtension`
+
+## Summary
+
+An extension which provides the functionality for inserting a `hardBreak` `<br />` tag into the editor.
+
+It will automatically exit when used inside a `codeClock`. To prevent problems occurring when the codeblock is the last node in the doc, you should add the `TrailingNodeExtension` which automatically appends a paragraph node to the last node.
+
+## Usage
+
+### Installation
+
+This extension is installed for you when you install the main `remirror` package.
+
+You can use the imports in the following way.
+
+```ts
+import { HardBreakExtension } from 'remirror/extensions';
+```
+
+To install it directly you can use
+
+The extension is provided by the `@remirror/extension-hard-break` package. There are two ways of pulling it into your project.
+
+### Examples
+
+See [storybook](https://remirror.vercel.app/?path=/story/extensions-hard-break--basic) for examples.
+
+## API
+
+### Options
+
+### Commands
+
+### Helpers