Implement Jupyter Notebook (ipynb) to HTML conversion for the notebook-based report system (described in https://sqr-023.lsst.io/v/DM-15003). This conversion is built on nbconvert. The main contributions of this ticket are:
- Theming of the HTML to look like an LSST document
- Integration with the sqre-uservice-nbreport microservice (ideally this is done with a celery task queue)
- Upload the HTML and notebook to LSST the Docs.