Link docs/icecast-latest to the most recent release
The index page links to docs/icecast-latest but no content is generated for that path. The repository includes a redirects.htaccess which sends docs/latest to docs/icecast-2.4.1 but that (a) does nothing on the current nginx config and (b) is the wrong url target.
Symlinks seem to work fine, so if jekyll could generate those (and they could survive the gitlab-ci artifact packaging) that's probably the best solution. Until then we have to have the update script special-case creating them when we deploy a new version of the site.