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/guide/faq.md

@@ -0,0 +1,39 @@
+# FAQ
+
+This page lists answers of FAQ.
+
+---
+
+### How can I change contents programmatically?
+
+You should use `editor.action` to change the contents.
+We provide two macros for that allow you to change content in milkdown, `insert` and `replaceAll`.
+
+```typescript
+import { insert, replaceAll } from "@milkdown/kit/utils";
+
+const editor = await Editor.make()
+  // .use(<All Your Plugins>)
+  .create();
+
+editor.action(insert("# New Heading"));
+
+editor.action(replaceAll("# New Document"));
+```
+
+---
+
+### How to configure remark?
+
+```typescript
+import { remarkStringifyOptionsCtx } from "@milkdown/kit/core";
+
+editor.config((ctx) => {
+  ctx.set(remarkStringifyOptionsCtx, {
+    // some options, for example:
+    bullet: "*",
+    fences: true,
+    incrementListMarker: false,
+  });
+});
+```