Uninstallation instructions

[OpenBagTwo]

GIVEN Steve no longer wants to use gsb (:cry:)

WHEN he goes to the gsb documentation and finds the page for offboarding instructions

THEN he finds a step-by-step guide with copy/pasteable commands and screenshots if needed that walks him through:

• listing all of his managed saves (#7)
• manually deleting the .git folder and .gsb_manifest file from each of those directories
  • while explaining to "Alex" and "M.A.R.I.L.L.A" that they're welcome to keep those folders and manage their backups with git
• uninstalling gsb itself, including deleting all configuration files

  SO that gsb isn't leaving a bunch of cruft on his machine

Notes