mkdocs setup

[melissawm]

Will allow local documentation set up with mkdocs serve --clean

Also fixes a few broken links resulting from the documentation restructure.

[melissawm]

Thanks for letting me know @timkpaine , this is still in draft as I figure out these issues, I'll make sure to fix. Cheers!

[timkpaine]

Closing as stale, we can revisit down the road