Repo misc fixes

[grarco]

Fix

• cargo check warnings
• review masp import
• all FIXMEs
• Add a phantom cohort with no tokens at the end of the ceremony to leave enough time to the participants of the last cohort for their contributions
• How to provide the contributors.json file to the frontend, two ways:
  • Keep the coordinator running forever while shutting down the join_queue endpoint (this would not require a phantom cohort)
  • Shut the coordinator down and publish the contributors.json file to S3
• Remove unused dependencies
• Produce final release tag
• Upload last contribution verified to S3?
• Fix messages and docs
• Rename phase1 to phase2

Test

• contribution on AnotherMachine
• token blacklisting
• Namada keypair generation
• restart of coordinator?

Review

• values for the env variables to set
• state of the Coordinator server
• state of the S3 server
• state of the Amazon Parameter Store