Remove `/light/` directory from `OSX` icons, as they have no dark variant 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.

Adding support up to and including Sequoia

Update to Ventura

Reference fileicon in readme

Readme tweaks

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

Readme tweak

Think this is good icon positioning

Attempt to center the arrow, cheeky but avoids tables and their borders when trying to do v-align and h-align

mask has to be in the project root as it appears the icon generation path is relational to the source path

improve readme

Generate missing icons

Folderify rebuild! Automated icon generation

Intermediate project re-structure release for Big Sur