These customizations (brand colors, responsive breakpoints, Frontend UI elements) could be configured and some even toggled on/off. Think about how many different styles of navigation exist, or carousels, and other UI components you could add from node package manager.
My webpack build would simply repeat what I already do locally before check-in: tailor a bundle of styles and JavaScript code that only includes the necessary files, concatenation, transpiled, concatenated, minified, and cache busted.
[Let me take a moment to apologize if I ended up posting this in the wrong channel!]
I’ll try to research running shell commands and I bet that’ll help me either answer the question or ask better ones! I was getting nowhere in my Google searches before. Thanks Jason.