docs: 引入 Fumadocs

ci: set up github actions

docs/app/provider.tsx

@@ -0,0 +1,8 @@
+'use client';
+
+import { RootProvider } from 'fumadocs-ui/provider';
+import type { ReactNode } from 'react';
+
+export function Provider({ children }: { children: ReactNode }) {
+  return <RootProvider>{children}</RootProvider>;
+}