Autofill or suggest instance name during input on login screen

**Is your feature request related to a problem? Please describe.**
Autofill instance name, or suggest matching ones as user is typing

**Describe the solution you'd like**
Instances that match the one the user is typing when attempting to login

**Describe alternatives you've considered**
n/a

**Additional context**
might be useful, esp. for new users. thanks.