Upgrade to webpack 5, minify build, use dist as browser main

[johallar]

Doesn't quite work... I think some other things need to change in webpack config

Merge Checklist

:wrench: Issue(s) fixed:

• [ ] Author referenced issue(s) fixed by this PR:
• [ ] Fixes #0

:smoking: Smoke Test

• [ ] Works in chrome
• [ ] Works in firefox
• [ ] Works in safari
• [ ] Works in ie edge
• [ ] Works in ie 11

:ship: Merge

• [ ] author crafted PR's title into release-worthy commit message.