Fix Broken Install Process

Sorry to everyone who had this breaking locally before this version!

1. The rollup processes were moved out of postinstall - the dependencies weren't ready yet. 🤦‍♂️
2. I added the files to the package.json so that only the rolled up dist is in your node_modules, hopefully avoiding any breaking issues. 🤞

This also fixed a FOUC edge case in Next.js. If anyone experienced that it's now gone. 💪