Add missing module import after update

.github/workflows/publish_mkdocs.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install Dependencies
         run: |
           pip install -r requirements.txt
-          pip install mkdocs-material==8.5.11 mkdocs-jupyter==0.22.0 neoteroi-mkdocs==0.1.2 pdocs==1.0.1
+          pip install mkdocs-material==8.5.11 mkdocs-jupyter==0.22.0 neoteroi-mkdocs==0.1.2 pdocs==1.0.1 lxml_html_clean==0.1.1
           python setup.py install
           mv config.txt.sample config.txt