I'd like to deprecate the doxygen site, but we're not quite there yet. Unfortunately, it looks like plumbing the eups release tag (v*, w_*, or d_*) through to the doxygen site generation or even to the aws cp command used to upload the site is somewhat difficult. It would be relatively easy to include the build number (bNNNN) in the site path, as suggested in the first bullet, but it's not clear that that's very useful.
So this ticket still seems useful for a while longer but not trivial to implement, and so it continues to be deprioritized.
Frossie Economou, Jonathan Sick, maybe this ticket has been superseded by the work on pipelines.lsst.io?