Make documentation available in a static offline format about clojure-site

[puredanger]

I spent a few minutes looking at this - it's definitely more work than I had expected. That is, it's easy to build, but difficult to build (right now) in a way that is self contained, css+js work, links work, etc. Unless there is some urgent need for this, I'm going to backlog this for now.

[puredanger]

This web site is statically built and you can build it yourself if you like using the instructions at https://github.com/clojure/clojure-site#building-the-site (and that's essentially the same process done during the site build, with some minor additions). I don't think it would be too hard to zip and publish that during the site build if that would be useful.

The API pages are separate - they are hosted on github pages and you can find them here: https://github.com/clojure/clojure/tree/gh-pages