Review Internal Initiatives

[rsyring]

List items from "Internal Initiatives" of Project Planning here.

Check them off if the work has been done or a separate issue has been created to track them. If the latter, list issue number here.

• [x] Switch app authorized keys management to file-based method
• [x] Replace the wheelhouse with pip-tools #71
• [x] Move to using timestamped venvs during deploy

[guruofgentoo]

Also switched from git-crypt to LP.

Addressed in #62.