Add redirects

Author: haydenbleasel

apps/website/next.config.ts

@@ -7,6 +7,26 @@ const config: NextConfig = {
   experimental: {
     turbopackFileSystemCacheForDev: true,
   },
+
+  redirects: async () => {
+    return [
+      {
+        source: "/docs/cjk-support",
+        destination: "/docs/plugins/cjk",
+        permanent: true,
+      },
+      {
+        source: "/docs/mermaid",
+        destination: "/docs/plugins/mermaid",
+        permanent: true,
+      },
+      {
+        source: "/docs/mathematics",
+        destination: "/docs/plugins/math",
+        permanent: true,
+      },
+    ];
+  },
 };
 
 export default withMDX(config);