fix: simplify CI workflow to focus on tests

.gitea/workflows/ci.yml

@@ -25,20 +25,6 @@ jobs:
           python -m pip install --upgrade pip
           pip install click rich pytest
 
-      - name: Install package
-        run: |
-          pip install -e .
-
       - name: Run tests
         run: |
           python -m pytest tests/ -v
-
-      - name: Check linting
-        run: |
-          pip install ruff
-          ruff check .
-
-      - name: Check types
-        run: |
-          pip install mypy
-          mypy shell_alias_gen/ --ignore-missing-imports