Add a GitHub Pages site

[alberdingk-thijm]

Since I've gotten into the habit of opening usability issues... It might be a nice idea to look into creating a webpage on GitHub Pages for nv. Some potential uses for such a website include:

• A more organized version of the wiki
• Pointers to papers and content related to nv
• A way to host the odoc documentation for the project (by getting Travis to run dune build @doc and saving the resulting documentation to a doc/ subfolder)

Again, this is something the project owner @princedpw would need to initially set up.

[alberdingk-thijm]

As further motivation of the last point, here is what you can now see when you run dune build @doc.

Having the most recent version of this publicly available is a nice way to make it easy to refer to both when developing and when trying to use the library.