Update config.yml

Author: AB-xdev

.github/ISSUE_TEMPLATE/config.yml

@@ -1,4 +1,7 @@
 contact_links:
+  - name: 🍃 Leaflet docs
+    url: https://leafletjs.com/reference.html
+    about: "Consolidate this when you have questions about Leaflet itself (and not our Vaadin component)"
   - name: 💬 Contact support
     url: https://xdev.software/en/services/support
     about: "If you need support as soon as possible or/and you can't wait for any pull request"