build: Build to dist/

[SimonAlling]

Now that we declare the public API using exports and typesVersions (#105), we can build to a dedicated directory instead of the repo root. I think this will also enable further simplifications down the road.

💡 git show --color-words='dist/\*{1,2}|\w+|.'

[SimonAlling]

Alright, so it seems like this doesn't work with Webpack 4.