Update issue templates

Author: ewilderj

.github/ISSUE_TEMPLATE/custom.md

@@ -0,0 +1,14 @@
+---
+name: Custom issue template
+about: For community repo issues
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+# Community repo
+
+The only issues you should file here concern the community's documentation or processes.
+
+All other bugs should be filed on the appropriate repo, questions directed to the various email groups, or if it's a "how-to" question, StackOverflow.