Fix CSS path used in file manager
Merge branch 'cpinkham' of https://github.com/FalconChristmas/fpp into cpinkham
Add missing images for jquery-ui theme.
Changes to allow git dir to be /opt/fpp instead of /home/pi/fpp

These will allow us to make this directory owned by root, the pi
user doesn't need to be able to update this directory.  If the
user does copy /opt/fpp to /home/pi/fpp then the local /home/pi/fpp
directory will be used instead to allow the user to develop or
modify code without breaking the stock /opt/fpp install.