docs : fix Esri community URL

I just changed the URL to the new questions board. I assume Esri Leaflet ideas shouldn't be placed in Esri Community.

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
 blank_issues_enabled: false
 contact_links:
   - name: Esri Community
-    url: https://community.esri.com/t5/esri-leaflet/ct-p/esri-leaflet
+    url: https://community.esri.com/t5/open-source-mapping-libraries-ques/bd-p/open-source-mapping-libraries-questions
     about: Ask questions and discuss with other Esri Leaflet users.