a3db9579

Improve query parameter removal (#175)

`PROJECT_ROOT` sometimes has a query parameter attached to it. The
previous method of trying to remove it didn’t work, so this uses a
simpler one that also doesn’t rely on non-greedy matching.

We could do a more precise job with non-greedy matching, but `sed`
doesn’t support that, so for now just trim everything starting from the
first `?`.