use developer.cal.com for swagger docs

apps/docs/next.config.js

@@ -3,4 +3,9 @@ const withNextra = require("nextra")({
   themeConfig: "./theme.config.js",
   unstable_staticImage: true,
 });
-module.exports = withNextra();
+
+module.exports = withNextra({
+  async rewrites() {
+    return [{ basePath: false, source: "/api", destination: "https://developer.cal.com" }];
+  },
+});