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()