Optimize bundle size

[raimohanska]

Current (development, unminified) bundle is over 2 megabytes which may not sound much, but it's grown significantly from th 600kb it was before Quill and Y.js.

Made by feeding dist/***.meta.json to esbuild bundle analyzer

[raimohanska]

... and here's the actual minified one (<1mb) from production...

[raimohanska]

When you stare at this, you start thinking "should we squeeze out the 77.6kb by sanitize-html" or maybe try to use some smaller distro of quill.js. Lodash is probably subotimal as well :)