Add documentation for using Milkdown with various frameworks

- Created a new document for using components in Milkdown.
- Added a guide for using plugins in Milkdown, including toggling plugins programmatically and listing official plugins.
- Introduced a recipe for integrating Milkdown with Angular, including installation steps and component creation.
- Added a recipe for using Milkdown with Next.js, detailing installation and component setup.
- Created a guide for integrating Milkdown with NuxtJS, including installation and component creation.
- Added a comprehensive guide for using Milkdown with React, covering both Crepe and core Milkdown usage.
- Introduced a recipe for SolidJS integration with Milkdown, including installation and component creation.
- Added a guide for using Milkdown with Svelte, detailing installation and component setup.
- Created a comprehensive guide for integrating Milkdown with Vue, covering both Crepe and core Milkdown usage.
- Added a recipe for using Milkdown with Vue2, including installation and component creation.

milkdown-docs/recipes/vue2.md

@@ -0,0 +1,44 @@
+# Vue2
+
+We don't provide Vue2 support out of box, but you can use the vanilla version with it easily.
+
+## Install the Dependencies
+
+```bash
+# install with npm
+npm install @milkdown/kit
+npm install @milkdown/theme-nord
+```
+
+## Create a Component
+
+Create a component is pretty easy.
+
+```html
+<template>
+  <div ref="editor"></div>
+</template>
+
+<script>
+  import { defaultValueCtx, Editor, rootCtx } from "@milkdown/kit/core";
+  import { commonmark } from "@milkdown/kit/preset/commonmark";
+  import { nord } from "@milkdown/theme-nord";
+
+  export default {
+    name: "Editor",
+    props: {
+      msg: String,
+    },
+    mounted() {
+      Editor.make()
+        .config((ctx) => {
+          ctx.set(rootCtx, this.$refs.editor);
+          ctx.set(defaultValueCtx, this.$props.msg);
+        })
+        .config(nord)
+        .use(commonmark)
+        .create();
+    },
+  };
+</script>
+```