chore: rebrand navbar + footer — tadpole logo, retrait Boutique nav, copyright Tetardtek

- Logo bretzel → tadpole.svg (navbar + footer)
- Retrait lien Boutique de la navigation (page conservée, masquée)
- Footer : texte Clickerz, GitHub Kevin T seul, © 2026 Tetardtek · Powered by Brain

Frontend/src/data/NavBarData.json

@@ -1,20 +1,14 @@
-[
-  {
-    "id": "1",
-    "linkname": "Jeu",
-    "linkurl": "/jeu",
-    "btn": false
-  },
-  {
-    "id": "2",
-    "linkname": "Boutique",
-    "linkurl": "/boutique",
-    "btn": false
-    },
-  {
-    "id": "3",
-    "linkname": "Succès",
-    "linkurl": "/achievements",
-    "btn": false
-  }
-]
+[
+  {
+    "id": "1",
+    "linkname": "Jeu",
+    "linkurl": "/jeu",
+    "btn": false
+  },
+  {
+    "id": "3",
+    "linkname": "Succès",
+    "linkurl": "/achievements",
+    "btn": false
+  }
+]