Update issue templates

.github/ISSUE_TEMPLATE/game-connection-issue.md

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+---
+name: Game Connection Issue
+about: 'Game issues are better served by our forum: https://discuss.zerotier.com'
+title: I'm probably submitting this issue in the wrong place
+labels: ''
+assignees: ''
+
+---
+
+Are you having trouble connecting to a game on your virtual network after installing ZeroTier?
+
+- [ ] Yes
+- [ ] No
+
+If you answered yes it's very likely that your question would be better answered on our [forums](https://discuss.zerotier.com) instead of creating a GitHub issue. Ideally, Github tickets should be reserved for suspected bugs and and feature requests.