fix: Disable jupyter-collaboration

Jupyter-collaboration produces a lot of trouble in our production
environments. The kernel dies regularly, the cursors jumps back,
sometimes it even resets content of cells.

jupyter-notebook/Dockerfile

@@ -32,7 +32,7 @@ ENV _OLD_VIRTUAL_PATH="$PATH"
 ENV VIRTUAL_ENV=/home/techuser/.venv
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
-RUN python3 -m pip install --no-cache-dir -r /etc/skel/requirements_template.txt jupyterlab jupyter-collaboration && \
+RUN python3 -m pip install --no-cache-dir -r /etc/skel/requirements_template.txt jupyterlab && \
     jupyter labextension disable "@jupyterlab/extensionmanager-extension" && \
     jupyter labextension disable "@jupyterlab/apputils-extension:announcements" && \
     mkdir /home/techuser/.jupyter && chown techuser /home/techuser/.jupyter