Move generated docs to gh-pages branch

[aggieben]

I think it will be easier to manage automated updates to the docs by committing them on the gh-pages branch; it will give us a place to commit changes coming from Azure Pipelines without dirtying up the commit history on actual active branches.

[aggieben]

This is done. There is now an Azure Pipeline build that will tag the sources, create the nuget package, push the documentation, and then publish the Nuget.org package.

[chriskrycho]

Huzzah!