Change the sidebar customization so that the full version (e.g. v0.8.2)
is displayed, instead of the truncated "releae branch version" (e.g.
v0.8) in the top left corner of the page. The items in the version menu
are unchanged and will still show the shorter form.
Only show the dynamic version menu in production environment where it's
available. Local (development) builds only show a stub version menu with
one item.
Also, fix the theme customization. Append version list items to the
correct element in html so that they are displayed correctly. Drop
unnecessary <div/>.
Make it hidden, by default. Unify style with other items in the navbar
(making version list horizontal, for example). Show current version next
to the caret mark that opens the menu.
Make the list of available versions dynamic. The items displayed is now
generated with javascript. The parent directory of the site is supposed
to contain versions.js providing getVersionListItems() that returns the
available versions.
The update-gh-pages.sh script is modified to update/create versions.js
on every invocation. It simply lists all directories in the root
directory and adds them to the version list.
Sync our customizations under _includes/ with v2.0.9 of
jekyll-rtd-theme. Also, pin the theme version in order to avoid abrupt
build failures in the future (caused by our customization becoming
incompatible with the rolling latest version).
Also, drop jekyll-rtd-theme from the Gemfile. It's useless there as it's
being mandated by remote-theme setting in _config.yml.
