Add issue templates

[ci skip]

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug report
+about: If something is definitely wrong in the bridge (rather than just a setup issue),
+  file a bug report. Remember to include relevant logs.
+labels: bug
+
+---

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Troubleshooting docs & FAQ
+    url: https://docs.mau.fi/bridges/general/troubleshooting.html
+    about: Check this first if you're having problems setting up the bridge.
+  - name: Support room
+    url: https://matrix.to/#/#signal:maunium.net
+    about: For setup issues not answered by the troubleshooting docs, ask in the Matrix room.

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement request
+about: Submit a feature request or other suggestion
+labels: enhancement
+
+---