Add pre-commit with CI and issue templates

.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/#/#discord: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
+
+---

.github/workflows/go.yml

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+name: Go
+
+on: [push, pull_request]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go-version: [1.18]
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Go ${{ matrix.go-version }}
+        uses: actions/setup-go@v3
+        with:
+          go-version: ${{ matrix.go-version }}
+
+      - name: Install goimports
+        run: |
+          go install golang.org/x/tools/cmd/goimports@latest
+          export PATH="$HOME/go/bin:$PATH"
+
+      - name: Install pre-commit
+        run: pip install pre-commit
+
+      - name: Lint
+        run: pre-commit run -a