Fix git-commit var syntax

Combine jobs within workflows

Update doc, Dockerfile to test GH Actions

I originally tested in my fork where everything happened to be a push to a branch in the same repo.

Switch to GitHub Actions for CI/CD

Removed optional texlive-fonts-extra

Update scipy-notebook packages

Update ubuntu image

Reduces the image size by >1 GB

Upgrading Ubuntu, miniconda and jupyterlab

suppress "id: jovyan: no such user" message during start

Updating sklearn to version 0.23

Miniconda py38 and Spark 3.0

r-notebook upgrade to R4.0