Modify GH Issues

- Only support bug report + feature requests
- Direct people to relevant docs/question places

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,11 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Chipyard Mailing List
+    url: https://groups.google.com/forum/#!forum/chipyard
+    about: Please ask and answer questions here.
+  - name: Rocket Chip Support
+    url: https://github.com/chipsalliance/rocket-chip/issues
+    about: Please ask and answer questions here.
+  - name: Chisel Support
+    url: https://www.chisel-lang.org/community.html
+    about: Please ask and answer questions here.