eggs-9.4.5

• btrfs: eggs produce now works fine on btrfs. Note: calamares and krill configuration for btrfs is not enabled by default;
• bugfix: eggs copy branding from themes including subdirs;
• bugfix: check theme if exists and remove final / if we pass a theme;
• bugfix: link penguins-eggs and others stuffs README.md connected to the new site;
• live boot: removed CLI boot option and added safe option, GRUB is now hidden with a 2 seconds timeout, same for isolinux.