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

docs/src/docPages/api/nodes/image.md

@@ -0,0 +1,21 @@
+# Image
+
+## Installation
+```bash
+# with npm
+npm install @tiptap/extension-image
+
+# with Yarn
+yarn add @tiptap/extension-image
+```
+
+## Settings
+| Option | Type    | Default | Description              |
+| ------ | ------- | ------- | ------------------------ |
+| inline | boolean | false   | Renders the node inline. |
+
+## Source code
+[packages/extension-image/](https://github.com/ueberdosis/tiptap-next/blob/main/packages/extension-image/)
+
+## Usage
+<demo name="Extensions/Image" />