Update README directions on when to `npm run build`
Update README directions on when to `npm run build`

need to `npm run build` a lot more since webpack was added

williamboman/lounge,ScoutLink/lounge,MaxLeiter/lounge,realies/lounge,FryDay/lounge,FryDay/lounge,thelounge/lounge,ScoutLink/lounge,realies/lounge,libertysoft3/lounge-autoconnect,libertysoft3/lounge-autoconnect,realies/lounge,MaxLeiter/lounge,libertysoft3/lounge-autoconnect,FryDay/lounge,williamboman/lounge,williamboman/lounge,MaxLeiter/lounge,ScoutLink/lounge,metsjeesus/lounge,metsjeesus/lounge,metsjeesus/lounge,thelounge/lounge