docs(nextjs): Add info on opting out of client/server bundles (#6057)

Author: navin-moorthy

src/platforms/javascript/guides/nextjs/manual-setup.mdx

@@ -429,3 +429,9 @@ const moduleExports = {
 Please note that this option will tunnel Sentry events through your Next.js application so you might experience increased server usage.
 
 Learn more about tunneling in the <PlatformLink to="/troubleshooting/#dealing-with-ad-blockers">troubleshooting section</PlatformLink>.
+
+### Opt Out of Sentry SDK bundling in Client or Server side
+
+If you want the `sentry` to be available in your server side & not in client side, you can make your `sentry.client.config.js` empty. This will prevent webpack from pulling in the Sentry related files when generating the browser bundle. The same goes the opposite for opting out of server side bundle by emptying `sentry.server.config.js`.
+
+You cannot delete the respective config files because the SDK requires you to have it.