Implement more comprehensive deep linking in Olympus

[atsakiridis]

Right now we support what is described here.

We additionally want to support:

• App to be installed if not installed on the device
• See if we can add preview
• Brainstorm about whether call should be audio or video

Also check for more ideas:

• Deep linking
• Firebase deep linking

[atsakiridis]

Deep linking doesn't really apply to a Demo App, still we might consider adding facilities for demonstration purposes