document describing the CI/CD

<img src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" decoding="async" class="lazy" data-src="https://img.shields.io/badge/reflectometry%20Task%20320%20-%20complete%20-%20grey">

Building the docs

$> cd /path/to/my/local/web_reflecivity/
$> conda activate webrefl  # or "make conda" ifenvironment "webrefl" was never created.
$> make devdocs

• To view the document, point the browser to file:///path/to/my/local/web_reflecivity/dev-docs/_build/html/devops/index.html
• a PDF printout of the document is here: devops.pdf