Define default instance URL in settings.json
What is the problem you are facing?
For people running the frontend on a different host than the backend, to get nice UX you currently need to build the frontend yourself with
VUE_APP_INSTANCE_URL=<host of backend>. Having that as a configuration option in the settings.json that is deployed with the frontend would mean that people don't need to build the frontend themselves to do that anymore.
What are the possible drawbacks or issues with the requested changes?
None that I can see.
Discussion in #funkwhale-dev: https://matrix.to/#/!nNBDNverFlbfNpReEO:matrix.org/$15468621552490NxEoS:gruenhage.xyz