Attempt (again) to establish issue template

Author: jnm

.github/ISSUE_TEMPLATE/issue.md

@@ -0,0 +1,14 @@
+---
+name: Issue
+about: Issue related to technical infrastructure of the documentation site
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+## Before you open an issue…
+
+Please note that the purpose of this issue tracker is to track work on the *technical infrastructure* of the documentation site. For requests related to the content of the documentation, please:
+* Post in Zulip [#Kobo support docs](https://chat.kobotoolbox.org/#narrow/stream/64-Kobo-support-docs) if you are a member of the Kobo team
+* Otherwise, post in the [community forum](https://community.kobotoolbox.org/c/support-article/29)