Add demo mode restrictions to user operations.

Added functionalities to restrict certain user operations like update, password change, and deletion in demo mode. This is done to prevent demo users from modifying crucial data. Helper methods are created for standard re-usable checks. Also, Blade directive is added for frontend UI demo checks.

resources/views/private/layout/app.blade.php

@@ -56,7 +56,7 @@
     </nav>
 
     <main class="content min-vh-100 position-relative pb-7 pb-lg-5">
-
+        @demo <p style="border: 1px solid #ff1810; color: #ff1810; font-weight: bold; font-size: 18px; padding: 7px; text-align: center;">{{ __('Demo Mode') }}</p> @endif
         <nav class="navbar navbar-top navbar-expand navbar-dashboard navbar-dark ps-0 pe-2 pb-2 pb-lg-3">
             <div class="container-fluid px-0">
                 <div class="d-flex justify-content-between w-100" id="navbarSupportedContent">