fix link to List of Extensions (#5493)

.github/ISSUE_TEMPLATE/config.yml

@@ -4,7 +4,7 @@ contact_links:
     url: https://github.com/tachiyomiorg/tachiyomi-extensions/issues/new/choose
     about: Issues and requests for extensions and sources should be opened in the tachiyomi-extensions repository instead
   - name: 📦 Tachiyomi extensions
-    url: https://github.com/tachiyomiorg/tachiyomi-extensions
+    url: https://tachiyomi.org/extensions
     about: List of all available extensions with download links
   - name: 🖥️ Tachiyomi website
     url: https://tachiyomi.org/help/