R1:9a7beadd22f0

Clean up some Ponder language

Summary:
Ref T9099.

- Remove unused function
- Fix celerity resource include
- Add a note when an answer's been closed
- Clean up architecture a little
- Add a better notice when you've already answered.

Test Plan: Test with and without answers, with answering, with being closed.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9099

Differential Revision: https://secure.phabricator.com/D13875