remove some unused stuff

[Rich-Harris]

Knip lets us find code that isn't actually used in the project. I think it probably makes sense to get rid of this lot

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[dummdidumm]

I vaguely remember that we wanted to keep this in so we don't forget? (yes you can do Git history searching but let's face it that's less likely to happen)

[Rich-Harris]

yeah, I just figured we'd probably start over given so much has changed since that was written. we can exclude it though if we want

[dummdidumm]

I'll defer to @trueadm on that one

[Rich-Harris]

gonna merge this because this code keeps polluting my search results, and we can always find optimize.ts by coming back here