move nodes and marks to a separate folder, add missing extensions

docs/src/docPages/api/marks/strike.md

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+# Strike
+Use this extension to render ~~striked text~~. If you pass `<s>`, `<del>`, `<strike>` tags, or text with inline `style` attributes setting `text-decoration: line-through` in the editor’s initial content, they all will be rendered accordingly.
+
+Type <code>&Tilde;&Tilde;text between tildes&Tilde;&Tilde;</code> and it will be magically ~~striked through~~ while you type.
+
+::: warning Restrictions
+The extension will generate the corresponding `<s>` HTML tags when reading contents of the `Editor` instance. All text striked through, regardless of the method will be normalized to `<s>` HTML tags.
+:::
+
+## Installation
+```bash
+# with npm
+npm install @tiptap/extension-strike
+
+# with Yarn
+yarn add @tiptap/extension-strike
+```
+
+## Settings
+| Option | Type   | Default | Description                                  |
+| ------ | ------ | ------- | -------------------------------------------- |
+| class  | string | –       | Add a custom class to the rendered HTML tag. |
+
+## Commands
+| Command | Options | Description                 |
+| ------- | ------- | --------------------------- |
+| strike  | —       | Mark text as strikethrough. |
+
+## Keyboard shortcuts
+* Windows/Linux: `Control`&nbsp;`D`
+* macOS: `Cmd`&nbsp;`D`
+
+## Source code
+[packages/extension-strike/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-strike/)
+
+## Usage
+<demo name="Extensions/Strike" highlight="3-5,17,36" />