Add roadmap management, service worker, and user invitation features

- Implemented roadmap.php for managing roadmap items with filtering options by quarter and status.
- Added a service worker (sw.js) to handle push notifications and click events for calendar appointments.
- Created users.php for admin to manage team members and invitations, including user creation and deletion functionalities.

.gitignore

@@ -0,0 +1,12 @@
+# Environment
+.env
+.env*.local
+
+# Systeem & Editor
+.DS_Store
+Thumbs.db
+*.log
+.vscode/
+.idea/
+config/.env.example
+config/config.php