Make is really obvious that the "dev" docs are for unrelease/development versions

[stuartarchibald]

It's not uncommon for users and search engines to find the dev docs and read them as "latest", the only real way to tell is the URL:
http://numba.pydata.org/numba-doc/dev/index.html
vs
http://numba.pydata.org/numba-doc/latest/index.html
i.e. dev vs. latest or that the release number is different, i.e. it's 0.49 vs 0.48 at present, however, unless you keep track of Numba development closely, that 0.49 isn't released yet is unlikely obvious.

Suggested fix: Make it really obvious that the "dev" version is for an unreleased version of Numba, perhaps add a header/banner to all pages expressing this and where to get dev builds and where the latest released version docs are?

[esc]

👍