Add support for CSS preprocessors like SASS or LESS

[burchardta]

It would be an absolute game changer to be able to code modules with a CSS preprocessor like LESS or SASS right in the Design Tools editor, which Hubspot would then compile, minify, and serve up as CSS files.

I know using LESS or SASS to build Hubspot pages can technically be accomplished already by writing code locally and compiling it into a local HubL server or by copying and pasting code into the editor, but these extra steps take away from the whole point of CSS precompilers: they make writing and editing front-end code easier, more efficient, and less time consuming.