Blender Cloud used main.css from Pillar
As we try to strip Blender Cloud-specific content from Pillar,
this commit brings three .sass files over to this repository.
There are still plenty of Blender Cloud classes all over Pillar,
they will be brought here over time.
Called "navigation_user", used at the moment by the
/welcome page for turning "Login" into "Login and Explore"
Also added the block name to {% endblock %} where it makes sense.
There is no functional change, just easier to read.
This removes the loadCSS() call, which uses setTimer() to repeatedly do
stuff while other stuff is loading. This saves quite a bit of CPU time
spent on JavaScript.
These pages were originally in the pillar repository, but they actually belong here. We also extended rsync_ui.sh to build and rsync to the Blender Cloud server.
