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

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

@@ -0,0 +1,32 @@
+# Code
+The Code extensions enables you to use the `<code>` HTML tag in the editor. If you paste in text with `<code>` tags it will rendered accordingly.
+
+Type something with <code>\`back-ticks around\`</code> and it will magically transform to `inline code` while you type.
+
+## Installation
+```bash
+# with npm
+npm install @tiptap/extension-code
+
+# with Yarn
+yarn add @tiptap/extension-code
+```
+
+## Settings
+| Option | Type   | Default | Description                                  |
+| ------ | ------ | ------- | -------------------------------------------- |
+| class  | string | –       | Add a custom class to the rendered HTML tag. |
+
+## Commands
+| Command | Options | Description               |
+| ------- | ------- | ------------------------- |
+| code    | —       | Mark text as inline code. |
+
+## Keyboard shortcuts
+* `Alt`&nbsp;<code>`</code>
+
+## Source code
+[packages/extension-code/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-code/)
+
+## Usage
+<demo name="Extensions/Code" highlight="3-5,17,36" />