fix: update issue template (#722)

* fix: update issue template

add additional information to be provided by user that should help in troubleshooting

* fix: move markdownlint config and link it

done it so the markdownlint-cli stops shouting about issues

* feat: add Matrix link

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

.github/ISSUE_TEMPLATE/config.yml

@@ -3,6 +3,9 @@ contact_links:
   - name: Ask on Gitter
     url: https://gitter.im/nektos/act
     about: You can ask for help here!
+  - name: Ask on Gitter (via Matrix)
+    url: https://matrix.to/#/#nektos_act:gitter.im?via=gitter.im&via=matrix.org
+    about: If you prefer Matrix over Gitter
   - name: Want to contribute to act?
     url: https://github.com/nektos/act/blob/master/CONTRIBUTING.md
     about: Be sure to read contributing guidelines!