Break out "ramify" the on-boot storage manipulation scripting

[nakato]

I've called the on-boot subvolume manipulation "ramify".

This could be useful outside SBC environments, so this issue tracks my plan to pull it into its own repo, or at the least its own module.

Additionally, by being a stand-alone module, it should be easier to see it exists and audit what it does, which is good seeing as it does file manipulation on boot.

[nakato]

RAMIFY is dead as it was called out that mkfs.btrfs with version 6.11 (not yet released) has a subvol option.

I am now now using mkfs.btrfs from HEAD, so the tooling is dead.