find and replace all hardcoded URLs in Vuejs config (.env.production)

[anastasia]

Sound URL needs to be set first so that sound files can be generated before anything else loads. A dev shouldn't need to know the IP address of their raspberry pi to have sounds work (if they're being served on local, apache server)

Right now when making any changes, we need to manually set VUE_APP_SOUND_LOCAL_URL to the raspberry pi IP address, port 80, etc., before we run npm run build. That's absurd!

A potential bad hack/viable fix is using regex on raspberry pi startup that find/replaces all localhost or whatever the Sound URL is set to, and changes it to the RPi's IP address.