feat: introduce Nest workspace for local Firecracker management

- Added a new server module for the Nest workspace, integrating with UVM's API.
- Updated project description to reflect the new Nest functionality.
- Created tests for the Nest server and CLI, ensuring proper functionality and error handling.
- Refactored existing UVM server code to separate Nest and UVM functionalities.
- Removed the old UVM dashboard assets package as it is now part of the Nest workspace.
- Enhanced error messages for clarity regarding server shutdown commands.

uvm/cli.py

@@ -1,4 +1,4 @@
-"""The sole public interface of this project: the local uvm CLI."""
+"""Command-line interface for UVM's local machine management services."""
 
 from __future__ import annotations
 
@@ -56,7 +56,7 @@ def build_parser(application: Application) -> argparse.ArgumentParser:
     parser.add_argument(
         "--serve",
         action="store_true",
-        help="launch the FastAPI management server instead of running a CLI command",
+        help="launch the UVM management API; use nest --serve for the workspace dashboard",
     )
     parser.add_argument(
         "--host",