Remove `/light/` directory from `OSX` icons, as they have no dark var…

…iant anyway

Added Sonoma and Sequoia icons, but the latest version of `folderify`…

… does not include support for OSX anymore, so I've now separated the two out into parent folders, with the `makefile` now only affecting `macOS` versions.

Update to Ventura

Merge pull request #2 from othyn/automate-via-folderify

Automate icon generation via folderify & make