add basic yjs extension with baked in web rtc support (wip)

docs/src/demos/Examples/Collaboration/index.spec.js

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+context('/examples/collaboration', () => {
+  before(() => {
+    cy.visit('/examples/collaboration')
+  })
+})

docs/src/demos/Examples/Collaboration/index.vue

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+<template>
+  <editor-content :editor="editor" />
+</template>
+
+<script>
+import { Editor, EditorContent } from '@tiptap/vue-starter-kit'
+import Document from '@tiptap/extension-document'
+import Paragraph from '@tiptap/extension-paragraph'
+import Text from '@tiptap/extension-text'
+import Yjs from '@tiptap/extension-yjs'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      content: `
+        <p>
+          This is a radically reduced version of tiptap. It has only support for a document, paragraphs and text. That’s it. It’s probably too much for real minimalists though.
+        </p>
+        <p>
+          The paragraph extension is not literally required, but you need at least one node. That node can be something different, for example to render a task list and only that task list.
+        </p>
+      `,
+      extensions: [
+        Document(),
+        Paragraph(),
+        Text(),
+        Yjs(),
+      ],
+    })
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>