Fix typo in doc/projects.md, replace images with backups
Fix typo in doc/projects.md, replace images with backups

Signed-off-by: Hiroaki Nakamura <d5f119c83b49083ce2220cbef65198e8f74dd9e4@gmail.com>

stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,lxc/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,atxwebs/lxd,stgraber/lxd,atxwebs/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd,atxwebs/lxd,lxc/lxd,stgraber/lxd,hallyn/lxd