Update package.json for new build process + cosmetics

[turt2live]

This is against travis/sourcemaps for safety.

Split from #3744

It is best to review this commit-by-commit.

---

This PR and others in the series have their overview covered here: https://gist.github.com/turt2live/a3fc7c9712b8ef0f1f758611aa33382d

[dbkr]

Your cosmetic changes aren't, in that you are removing git-revision.txt and docs from the npm package and you're turning off source maps, both of which seem odd?

[turt2live]

the -s was redundant - sourcemaps are still a thing. git-revision.txt was just moved elsewhere in the list (slight reorganization), though docs going missing is a bug.

[dbkr]

Ah, not sure how I missed git-revision.txt. Presumably the source maps thing is specifically from the fact that babelrc.js now has a source maps option?

[turt2live]

That's the theory, and a believable one.

[dbkr]

Winner then 👍