Refactor user authentication and dashboard features

- Added `is_admin` field to User model for role management.
- Updated user context middleware to include current user in templates.
- Enhanced session management with improved debug middleware.
- Refactored dashboard view to fetch user-specific data and recent events.
- Improved login and registration templates for better user experience.
- Added admin routes with access control for admin users.
- Updated Docker configuration for better error logging and dependency management.
- Updated requirements to include new dependencies and specify versions.

app/templates/profile.html

@@ -6,7 +6,7 @@
     <div class="bg-irish-green text-white p-6">
       <div class="flex flex-col sm:flex-row items-center">
         <div class="w-24 h-24 rounded-full bg-white border-4 border-white overflow-hidden mb-4 sm:mb-0 sm:mr-6">
-          <img src="https://via.placeholder.com/150" alt="Profile" class="w-full h-full object-cover">
+          <img src="https://picsum.photos/150" alt="Profile" class="w-full h-full object-cover">
         </div>
         <div class="text-center sm:text-left">
           <h1 class="text-2xl font-bold">John Quizmaster</h1>