[FEATURE] locus:// URL scheme with locus.cfd

[jbmagination]

Is your feature request related to a problem? Please describe.
As described in #11, Locus does not work with universal / deep links on iOS without a paid membership. I'd still like to avoid having to go through the web and instead straight into the Locus app.

Describe the solution you'd like
Add a locus:// URL scheme to workaround the lack of universal / deep links. This also would allow other Locus links that aren't locus.cfd to work with Locus for iOS, too.

Describe alternatives you've considered
I do know that fossapp394:// exists but locus:// looks and sounds better, and fossapp394:// doesn't look like it's in use anyways.

Additional context
No additional context.