Merge branch '4-google-analytics-4', issue #4

Update to Google Analytics 4 property, issue #4

Merge branch '2-mkdocs-1', issue #2

Update the documentation to MkDocs 1.x, cleanup, issue #2

Minor change to README.md related to license

Minor change to README.md to clarify editing and viewing.

Minor cleanup in README.md file

Merge branch '1-material-theme'

Convert to use Material theme. Update content based on review.

Initial version of website content

Initial commit