[JOSS review] Compiled documentation

[nick-gorman]

Is the documentation compiled into a pdf or html version anywhere? It's a bit hard to follow reading through the docs folder.

openjournals/joss-reviews#4460

[kcerva]

Thank you for this observation @nick-gorman. We've added information on the ReadMe on how to see the documentation- either on mkdocs or with a link to a static site.