molssi-seamm/seamm_dashboard: Front end improvements

This PR improves some UI features of the SEAMM dashboard

• Adds visualization of unit cell for molecules with unit cell.
• Adds option to make project publicly readable
• Fixes table headers on the front page
• adds support for visualization of cube files.
• adds the ability to set the name of a dashboard using the option --dashboard-name. By default, the dashboard name will be set to the (computer) hostname, which is obtained from socket.gethostname().