Add determineHostName() function?

[peacekeeper]

In universal-resolver-frontend, we have a determineHostName() function for making axios calls to the backend API:

https://github.com/decentralized-identity/universal-resolver-frontend/blob/main/src/components/utils.js

Should we do the same here in universal-registrar-frontend?

@BernhardFuchs

[BernhardFuchs]

This was needed for the case that the frontend and backend are not on the same host. It was a requirement from about a year ago.
I would rather say we remove that functionality from the resolver, if we don't intend to use it.