website: Add delete message feature for admins

[rjmacarthy]

This PR addresses point number two for issue #1022 which add the ability to delete a message from the actions drop-down menu. The back-end requires some work for individual message not to return after being deleted.

Any questions or concerns please let me know.

[github-actions[bot]]

:x: pre-commit failed. Please run pre-commit run --all-files locally and commit the changes. Find more information in the repository's CONTRIBUTING.md