Major changes to the Gardenhouse structure

As Gardenhouse grows beyond just immutable Gentoo images, it became difficult to organize all the repositories under my personal Codeberg profile. Gardenhouse now has its own Codeberg organization! https://codeberg.org/Gardenhouse. The repositories under git.pinkro.se remain under the same path, as they were already ordered in a Gardenhouse subpath.

Additionally, as Gardenhouse contains many utilities that are not exclusively part of Gardenhouse (as in the system images), the shared names have started causing some confusion wether the utilities may be used in other distributions.

To clear this confusion, and make talking about Gardenhouse simpler, the image builder has been renamed to Florist! Gardenhouse now refers to the organization as a whole, while Florist refers to the image builder itself. Hopefully this will clear up any confusion!