Confirmation page and minor improvements to homepage and form messages

Basic redirect with flash messages for success and error messages

templates/login.html

@@ -5,7 +5,7 @@ block content %}
     <div class="text-center">
       <h2 class="text-3xl font-bold text-gray-900">Login</h2>
       <p class="mt-2 text-sm text-gray-600">
-        Sign in to access the admin dashboard
+        Sign in to access the admin dashboard.
       </p>
     </div>
 
@@ -53,7 +53,7 @@ block content %}
         </div>
       </form>
 
-      <div class="mt-4">{{ error_html }}</div>
+      <div class="mt-4 text-center">{{ error }}</div>
     </div>
 
     <div class="text-center">