Overhaul issue templates

.github/SUPPORT.md

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+# Support
+
+Jellyfin contributors have limited availability to address general support
+questions. Please make sure you are using the latest version of Jellyfin.
+
+When looking for support or information, please first search for your
+question in these venues:
+
+* [Jellyfin Forum](https://forum.jellyfin.org/)
+* [Jellyfin Documentation](https://jellyfin.org/docs/)
+* [Open or ****closed**** issues in the Jellyfin GitHub organization](https://github.com/issues?q=sort%3Aupdated-desc+org%3Ajellyfin+is%3Aissue+)
+
+If you didn't find an answer in the resources above, contributors and other
+users are reachable through the following channels:
+
+* [#jellyfin-troubleshooting:matrix.org](https://matrix.to/#/#jellyfin-troubleshooting:matrix.org%22) or [on IRC](https://webchat.freenode.net/#jellyfin)
+* [#jellyfin:matrix.org on Matrix](https://matrix.to/#/#jellyfin:matrix.org) or [on IRC](https://webchat.freenode.net/#jellyfin-troubleshooting)
+* [/r/jellyfin on Reddit](https://www.reddit.com/r/jellyfin)
+
+GitHub issues are for tracking enhancements and bugs, not general support.
+
+The open source license grants you the freedom to use Jellyfin. It does not
+guarantee commitments of other people's time. Please be respectful and manage
+your expectations.