feat: Set up new Tailwind CSS configuration, global styling, and initial application pages.

packages/gatekeeper/dev-output.log

@@ -0,0 +1,15 @@
+
+> @mintel/gatekeeper@1.0.0 dev
+> next dev
+
+ ⚠ Port 3000 is in use, trying 3001 instead.
+   ▲ Next.js 15.1.6
+   - Local:        http://localhost:3001
+   - Network:      http://192.168.1.126:3001
+   - Experiments (use with caution):
+     · clientTraceMetadata
+
+ ✓ Starting...
+warn  - It seems like you don't have a global error handler set up. It is recommended that you add a global-error.js file with Sentry instrumentation so that React rendering errors are reported to Sentry. Read more: https://docs.sentry.io/platforms/javascript/guides/nextjs/manual-setup/#react-render-errors-in-app-router (you can suppress this warning by setting SENTRY_SUPPRESS_GLOBAL_ERROR_HANDLER_FILE_WARNING=1 as environment variable)
+ ✓ Ready in 2.7s
+[?25h