Daemon mode, server config override, and bug fixes

Server supports running as daemon
This release introduces a new flag to start the Daytona server as a daemon. Run daytona server -d to start the server as a daemon, and daytona server start/daytona server stop to control the lifecycle.
Override server configuration using environment variables (#241)
This release allows you to override Daytona's server configuration at runtime using environment variables. Setting configuration this way will override the values contained in Daytona's configuration file.

Default to home directory if Project directory does not exist (#237)
This release fixes a case where daytona ssh would fail if the Project directory did not exist.

For more information on Daytona v0.6, refer to the GitHub release page.