move examples to own directory, add demo component to all example pages

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

@@ -0,0 +1,32 @@
+<template>
+  <editor-content :editor="editor" />
+</template>
+
+<script>
+import { Editor, EditorContent, defaultExtensions } from '@tiptap/vue-starter-kit'
+
+export default {
+  components: {
+    EditorContent,
+  },
+
+  data() {
+    return {
+      editor: null,
+    }
+  },
+
+  mounted() {
+    this.editor = new Editor({
+      content: '<p>foo</p>',
+      extensions: defaultExtensions(),
+    })
+
+    window.editor = this.editor
+  },
+
+  beforeDestroy() {
+    this.editor.destroy()
+  },
+}
+</script>