Add contact links when choosing issue template (#2226)

Configuring the template chooser to include discord community server.

.github/ISSUE_TEMPLATE/config.yml

+# Ref: https://help.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
+blank_issues_enabled: true
+contact_links:
+- name: '💬 Discord Server'
+  url: https://discordapp.com/invite/awxPgve
+  about: |
+    Chat with the community, ask questions and learn about best practices.