Remove flux docs

[zpao]

We're basically keeping 2 copies of documentation in sync and failing. We should just point at http://facebook.github.io/flux/docs/overview.html and http://facebook.github.io/flux/docs/todo-list.html.

We should maybe make the permalinks on our site redirect or just link offsite. We should also look for links in our docs pointing to those pages and update.

[zpao]

cc @fisherwebdev

[zpao]

also cc @vjeux

[vjeux]

Definitively agreed, we should link all the traffic to the dedicated website. See the Complementary section on Flux website

http://facebook.github.io/flux/docs/overview.html#content