feat: add learn dropdown menu

docusaurus.config.js

@@ -30,7 +30,21 @@ module.exports = {
         {label: "FAQ", position: "left", to: "/faq"},
         {label: "Tarifs", position: "left", to: "/tarifs"},
         {label: "Doc", position: "left", type: "doc", docId: "intro", },
-        {label: "🎁 Antisèche et Communauté git", position: "left", to: "/communaute"},
+        {
+          type: "dropdown",
+          label: "🎓 Apprendre",
+          position: "left",
+          items: [
+            {
+              label: "🎁 Antisèche et Communauté git",
+              to: "/communaute",
+            },
+            {
+              label: "L'Académie : mentorat de groupe",
+              href: "https://vu.fr/AcademieFroggit",
+            },
+          ],
+        },
         {
           label: "👤 Connexion",
           position: "right",