Start frontend server with node instead of npm
Start frontend server with node instead of npm

This closes policycompass/policycompass-frontend#8.

FabiApfelkern/policycompass,policycompass/policycompass,FabiApfelkern/policycompass,FabiApfelkern/policycompass,policycompass/policycompass,policycompass/policycompass