Revert "Add dotenv package for environment variable management and update pnpm-lock.yaml. Adjust layout in RegisterPage and LoginPage components for improved responsiveness. Enhance AdminPanel with ChallengeManagement section and update navigation links for challenges. Refactor Prisma schema to include Challenge model and related enums."

This reverts commit f093977b34.

components/admin/AdminPanel.tsx

@@ -4,7 +4,6 @@ import { useState } from "react";
 import UserManagement from "@/components/admin/UserManagement";
 import EventManagement from "@/components/admin/EventManagement";
 import FeedbackManagement from "@/components/admin/FeedbackManagement";
-import ChallengeManagement from "@/components/admin/ChallengeManagement";
 import BackgroundPreferences from "@/components/admin/BackgroundPreferences";
 import { Button, Card, SectionTitle } from "@/components/ui";
 
@@ -19,7 +18,7 @@ interface AdminPanelProps {
   initialPreferences: SitePreferences;
 }
 
-type AdminSection = "preferences" | "users" | "events" | "feedbacks" | "challenges";
+type AdminSection = "preferences" | "users" | "events" | "feedbacks";
 
 export default function AdminPanel({ initialPreferences }: AdminPanelProps) {
   const [activeSection, setActiveSection] =
@@ -68,14 +67,6 @@ export default function AdminPanel({ initialPreferences }: AdminPanelProps) {
           >
             Feedbacks
           </Button>
-          <Button
-            onClick={() => setActiveSection("challenges")}
-            variant={activeSection === "challenges" ? "primary" : "secondary"}
-            size="md"
-            className={activeSection === "challenges" ? "bg-pixel-gold/10" : ""}
-          >
-            Défis
-          </Button>
         </div>
 
         {activeSection === "preferences" && (
@@ -117,15 +108,6 @@ export default function AdminPanel({ initialPreferences }: AdminPanelProps) {
             <FeedbackManagement />
           </Card>
         )}
-
-        {activeSection === "challenges" && (
-          <Card variant="dark" className="p-6">
-            <h2 className="text-2xl font-gaming font-bold mb-6 text-pixel-gold">
-              Gestion des Défis
-            </h2>
-            <ChallengeManagement />
-          </Card>
-        )}
       </div>
     </section>
   );