Migrate away from Less

[vanillajonathan]

Migrate away from Less stylesheets to Sass or plain old CSS.

Less have been on the decline and other frameworks such as Bootstrap have switched from Less to Sass.

[SamMousa]

What about moving to pure CSS? Simplifies the build and this library is so small that it should suffice.

[vanillajonathan]

Yeah, I think it would be a good idea. Modern CSS nowadays support nesting too.

[SamMousa]

I'm working on a PR that moves to esbuild. It'll move us to vanilla css too

[SamMousa]

#187