move everything around, add more content and a first test for images

docs/src/demos/Nodes/Heading/index.vue

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+<template>
+  <div v-if="editor">
+    <button @click="editor.chain().focus().heading({ level: 1 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 1 }) }">
+      h1
+    </button>
+    <button @click="editor.chain().focus().heading({ level: 2 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 2 }) }">
+      h2
+    </button>
+    <button @click="editor.chain().focus().heading({ level: 3 }).run()" :class="{ 'is-active': editor.isActive('heading', { level: 3 }) }">
+      h3
+    </button>
+
+    <editor-content :editor="editor" />
+  </div>
+</template>
+
+<script>
+import { Editor } from '@tiptap/core'
+import { EditorContent } from '@tiptap/vue'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Heading from '@tiptap/extension-heading'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Heading({
+          levels: [1, 2, 3],
+        }),
+      ],
+      content: `
+        <h1>This is a 1st level heading</h1>
+        <h2>This is a 2nd level heading</h2>
+        <h3>This is a 3rd level heading</h3>
+        <h4>This 4th level heading will be converted to a paragraph, because levels are configured to be only 1, 2 or 3.</h4>
+      `,
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>