add a delete announcement handler/endpoint

[ALackey-ai]

As an admin, I want to be able to delete an announcement, so that I can remove incorrect/outdated info

Definition of Done

• [ ] add handler and endpoint

Tasks

• [ ] create delete handler and endpoint for announcements

[ALackey-ai]

created the handler and dao function to support deleting specific announcements, will start testing it now to ensure it works correctly. [t:25]

[ALackey-ai]

Tested it, made a few slight changes and it works! Ready to be pushed into main... [t:15]