We should have a default_server_name config.json property that defaults homeserver url and identity server url via .well-known #8763
Description
My matrix homeserver runs at https://matrix.lant.uk. The server name is lant.uk.
config.json:
{
"default_server_name": "lant.uk"
}
Then, when you go to https://riot.lant.uk (don't, it doesn't exist), you'll see the nice and simple UX:
i.e. no server picker three-way option box, everything looked up via https://lant.uk/.well-known/matrix/client