R1:95a806ada306

Remove `celerity.resource-path` config

Summary: Ref T4222. This was used by Facebook while developing Releeph, but should no longer be necessary since Releeph is in the upstream. I can't get an answer out of Facebook about whether they still use it or not (see T4227), so nuke it. We're going to replace it with a more general mechanism (see T4222).

Test Plan: Regenerated celerity map. Browsed some pages, still got resources.

Reviewers: btrahan, hach-que

Reviewed By: hach-que

CC: aran

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