Update the netbox-discuss mailing list URL

.github/ISSUE_TEMPLATE/bug_report.md

@@ -11,7 +11,7 @@ about: Report a reproducible bug in the current release of NetBox
     NetBox installation, or if you have a general question, DO NOT open an
     issue. Instead, post to our mailing list:
 
-        https://groups.google.com/forum/#!forum/netbox-discuss
+        https://groups.google.com/g/netbox-discuss
 
     Please describe the environment in which you are running NetBox. Be sure
     that you are running an unmodified instance of the latest stable release

.github/ISSUE_TEMPLATE/config.yml

@@ -5,5 +5,5 @@ contact_links:
     url: https://github.com/netbox-community/netbox/blob/develop/CONTRIBUTING.md
     about: Please read through our contributing policy before opening an issue or pull request
   - name: 💬 Discussion Group
-    url: https://groups.google.com/forum/#!forum/netbox-discuss
+    url: https://groups.google.com/g/netbox-discuss
     about: Join our discussion group for assistance with installation issues and other problems

.github/ISSUE_TEMPLATE/feature_request.md

@@ -11,7 +11,7 @@ about: Propose a new NetBox feature or enhancement
     If you have a general idea or question, please post to our mailing list
     instead of opening an issue:
 
-        https://groups.google.com/forum/#!forum/netbox-discuss
+        https://groups.google.com/g/netbox-discuss
 
     NOTE: Due to an excessive backlog of feature requests, we are not currently
     accepting any proposals which significantly extend NetBox's feature scope.
@@ -21,8 +21,8 @@ about: Propose a new NetBox feature or enhancement
     before submitting a bug report.
 -->
 ### Environment
-* Python version:  <!-- Example: 3.6.9 -->
-* NetBox version:  <!-- Example: 2.7.3 -->
+* Python version: 
+* NetBox version: 
 
 <!--
     Describe in detail the new functionality you are proposing. Include any