docs/conversion-to-mkdocs

[bgunnar5]

This branch contains the changes necessary to port our docs from sphinx to mkdocs. I reorganized the docs to fit this new format, added auto-generated API docs, and introduced a new Examples page that will have in-depth explanations of each example. For now the only example that's complete in this page is the hello example but you can use that as a basis to see what the rest will eventually look like.