Yeah this is actually my canned response on one of my own projects, and I'm tired of copying and pasting it. Nobody reads CONTRIBUTING.md
"GitHub issues are for bugs / installation problems / feature requests. For general support from the community, see [StackOverflow](link)"
However, we still get plenty of issues filed that are more appropriate for StackOverflow, so not sure there's anything technical you can do without integrating more closely with StackOverflow :)