feat(docs): add middleware matcher

apps/docs/src/middleware.ts

@@ -77,3 +77,22 @@ function getContentSecurityPolicyHeaderValue(nonce: string, reportUri: string):
     .map(([key, value]) => `${key} ${value.join(" ")}`)
     .join("; ");
 }
+
+export const config = {
+  matcher: [
+    /*
+     * Match all request paths except for the ones starting with:
+     * - api (API routes)
+     * - _next/static (static files)
+     * - _next/image (image optimization files)
+     * - favicon.ico (favicon file)
+     */
+    {
+      source: "/((?!api|_next/static|_next/image|favicon.ico).*)",
+      missing: [
+        { type: "header", key: "next-router-prefetch" },
+        { type: "header", key: "purpose", value: "prefetch" },
+      ],
+    },
+  ],
+};