update build workflow and config

.gitea/workflows/mkdocs_build.yml

@@ -10,27 +10,22 @@ jobs:
   build-and-deploy:
     runs-on: ubuntu-latest-intranet
     steps:
-    - name: Checkout
-      uses: actions/checkout@v4
-    
-    - name: Mkdocs build
-      run: |
-        python3 -m venv mkdocs_venv
-        source mkdocs_venv/bin/activate
-        pip install -r requirements.txt      
-        mkdocs build -d public
-    
+    - uses: actions/checkout@v6
+
     - name: Configure Git
       run: |
         git config --global user.name "Gitea Actions"
         git config --global user.email "actions@gitea.local"
 
-    - name: Push to gitea-pages branch
+    - uses: actions/setup-python@v6
+      with:
+        python-version: "3.x"
+
+    - name: Install mkdocs-material
       run: |
-        git checkout --orphan gitea-pages
-        git reset --hard
-        ls -la
-        cp -r ./public/* .
-        git add .
-        git commit -m "Deploy site"
-        git push -f https://${{secrets.GITHUB_TOKEN}}@gitea.psi.ch/${{ github.repository }}.git gitea-pages
+        apt-get update
+        apt-get install -y pngquant
+        pip install -r requirements.txt
+
+    - name: Deploy documentation
+      run: mkdocs gh-deploy --force -b gitea-pages