move all extensions to separate pages

docs/src/docPages/api/extensions/blockquote.md

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+# Blockquote
+Allows you to use the `<blockquote>` HTML tag in the editor.
+
+#### Options
+*None*
+
+#### Commands
+| command | options | description |
+| ------ | ---- | ---------------- |
+| blockquote | none | Wrap content in a blockquote. |
+
+#### Keybindings
+* `Control` + `→`
+
+#### Example
+```markup
+<template>
+  <div>
+    <editor-menu-bar :editor="editor" v-slot="{ commands, isActive }">
+      <button type="button" :class="{ 'is-active': isActive.blockquote() }" @click="commands.blockquote">
+        Blockquote
+      </button>
+    </editor-menu-bar>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor, EditorContent, EditorMenuBar } from 'tiptap'
+import { Blockquote } from 'tiptap-extensions'
+
+export default {
+  components: {
+    EditorMenuBar,
+    EditorContent,
+  },
+  data() {
+    return {
+      editor: new Editor({
+        extensions: [
+          new Blockquote(),
+        ],
+        content: `
+          <blockquote>
+            Life is like riding a bycicle. To keep your balance, you must keep moving.
+          </blockquote>
+          <p>Albert Einstein</p>
+        `,
+      }),
+    }
+  },
+  beforeDestroy() {
+    this.editor.destroy()
+  }
+}
+</script>
+```