Tuckr: download ældre versioner

Additions
- Added a new mdbook to replace the previous github wiki. It can be found in here (CI added on #119)
- Added better error message for when a script doesn't have proper permissions to be executed
- Added resolution of shared groups between different dotfile profiles
- Added missing functionality in tuckr unset. Wildcards are now properly handled and the command is aware of conditional groups
Fixes
- Fixed unsupported groups not being displayed with tuckr status <group> when the base group doesn't exist
- Fixed regression causing tuckr init to never work
- Fixed custom groups not being detected (#114)
- Fixed from-stow unable to find dotfiles path and crashing when a dotfiles dir already exists
- Fixed validation for config files being skipped when the target is a directory (#118)
- Fixed --adopt removing the wrong file sometimes (#118)
- Fixed regression causing shared directory resolution to be finicky
- Fixed regression where base groups could no longer be used if related conditional groups existed
- Fixed the way hooks are spawned on windows so they're more inline with how they work everywhere else
- Fixed groupis command not working properly on windows
- Fixed files outside of group directories in Hooks causing a panic