This tutorial is based on the video tutorials by Cédric Hauteville you can watch them here: https://www.youtube.com/playlist?list=PLFV9z59nkHDccUbRXVt623UdloPTclIrz parts of it were also lifted from the Foundry VTT Boilerplate system by XXX.
Icons have been sourced from https://game-icons.net
This system uses less for CSS you can see a good installation guide for VSCode at https://code.visualstudio.com/docs/languages/css#_transpiling-sass-and-less-into-css
User Notes
Skill Categories and Skills cannot be renamed if they are owned and you cannot drag a duplicate named skill to the sheet