[Feature] Implement Client Deletion via the Client Management Dashboard

[artkolpakov]

The application currently does not support client deletion via the Client Management Dashboard with the delete button being disabled:

Proposed Implementation:

To implement the client deletion functionality, follow these steps:

1. Backend API Implementation:

• Implement the DELETE API endpoint (and a file for it) within the backend/api/clients directory to handle client deletion logic.
• Ensure that a client record is actually deleted from the database with a 200 status code when a user with appropriate permissions makes the request. Handle the 404 status code for cases where the client does not exist.
• Add the /delete path for the implemented endpoint in the backend/api/clients/urls.py file.

2. Frontend Integration:

• Enable and hook up the delete button in the pages/clients/dashboard/_rows.html file to call the client deletion API.
• Implement pop-up messages on the Client Management Dashboard page to reflect the success of the API call (similar to the one indicating successful client creation).
• Ensure that the deleted client is removed from the clients table in pages/clients/dashboard/_table.html upon successful deletion.

The proposed implementation aims to allow users to delete clients using the client management dashboard, improving the overall functionality and user experience of the application.