github: Add subreddit as contact link
github: Add subreddit as contact link

This is yet another way to steer people towards reddit for questions
instead of using the github issue tracker

Ref: https://help.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser

jaagr/polybar,jaagr/polybar,jaagr/polybar