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

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

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