Reconsider JS compression process

In !57 (merged) we discussed how to deal with static files which should be minified/compressed in the production deployment.

The solution that was implemented, committing the compressed versions in the repo, is making MR review more complicated than it should be, because it requires a manual review to ensure the compressed javascript code is accurately built from the source file.

We should probably be building the minified/compressed version when we build the container instead.