ENH: Make trial build URLs real, not require replacement

[corneliusroemer]

When making trial builds, the URL we output at the moment for where one can view is actually not a URL where one can see anything.

I'd prefer if we just output one example URL where one can see something, rather than REGION_NAME

I've been confused by this in the past, and so has at least @emmahodcroft

This should be a simple change?

[joverlee521]

#991 should resolve this.