Rename .github folder to .gitea. Use pre-commit directly instead of action

.gitea/workflows/lint-and-security.yml

@@ -0,0 +1,29 @@
+name: Lint & Security
+
+on:
+  pull_request:
+
+jobs:
+  precommit-and-security:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+
+      - name: Install pre-commit
+        run: pip install pre-commit
+
+      - name: Run pre-commit hooks
+        run: pre-commit run --all-files --color always
+
+      - name: Install pip-audit
+        run: pip install pip-audit
+
+      - name: Run pip-audit
+        run: pip-audit