URL shortening for the public instance

Created by: strumlovesgorm

Feature request description

• A shortened URL for the public instance to make sharing URLs easier.
• Example : https://sourcegraph.com/github.com/golang/go/-/blob/src/net/http/httptest/httptest.go#L41:6&tab=references being shortened to something like https://src.gr/GxOyRzM

Is your feature request related to a problem? If so, please describe.

• Nah

Describe alternatives you've considered.

• Using third party URL shorteners?

Additional context

• I notice srcgra.ph being owned by Sourcegraph. Something shorter than that would be even better. Also, GORM <3