Make builds faster and simplify test setup

[nilsnh]

Milestone

A couple of tweaks to speed up build speed and remove config.

The builds are already plenty fast, but I had some extra time on my hands and it was fun to try and make the builds even faster and cleaner.

Getting there / Interesting bits

• I typed out some thorough message on individual commits. Do check them out.
• To speed up builds even more we could look at using Yarn, but I think that would add unnecessary complexity for new contributors.

What I need help with

• Not in a big need for help here, but do ask questions if these changes seem unclear.

What's next

After merging, this PR should allow us to:

• Have (a little bit) faster builds. ⚡

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