Move doc to 'en' subfolder

.github/workflows/quality.yml

@@ -0,0 +1,23 @@
+name: Quality Check
+
+on: [pull_request]
+
+jobs:
+  quality:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3.1.0
+    - name: Set up Python 3.9
+      uses: actions/setup-python@v3
+      with:
+        python-version: 3.10
+        cache: 'pip'
+        cache-dependency-path: 'setup.py'
+    - name: Install Python dependencies
+      run: pip install -e .[quality]
+    - name: Run Quality check
+      run: make quality
+    - name: Check if failure
+      if: ${{ failure() }}
+      run: |
+        echo "Quality check failed. Please ensure the right dependency versions are installed with 'pip install -e .[quality]' and rerun 'make style; make quality;'" >> $GITHUB_STEP_SUMMARY