Direct link to an OPTIMADE DB

It would be great to be able to directly link to a specific OPTIMADE API endpoint.

E.g. via a URL parameter, something like

http://optimadeclient.materialscloud.io/?base_url=%22https://optimade.materialscloud.org/main/mc3d-pbe-v1/%22

For the provider dropdown, the easiest in this case probably would be to open and pre-fill the "Custom endpoint..." option.