Rollup.js Support

Hi guys, css-blocks is really awesome, and I would like to know is there any plan for supporting Rollup.js? I want to use it in Rollup.js but I found it's not supported yet.

Start by reviewing the css-blocks repository's existing build and bundler support, then identify the entry points needed for Rollup.js integration. Confirm the expected Rollup.js configuration and compatibility requirements before defining the work. Done means css-blocks can be used in a Rollup.js project with documented, working support.

Written by the indexing model from the issue text.