Showcase Page Refinements

Picking up from #501 and #638, here is a list of possible refinements / enhancements for the new Passenger Showcase!

https://thecodingtrain.com/showcase

### Individual Passenger Pages

For example: https://thecodingtrain.com/showcase/author/kathy-mcguiness

* It would be nice to include additional information as headers (name and link to URL) for each passenger, making it feel a bit more like a "profile page"?
* The "preview" image when sharing a page should grab a passenger showcase thumb rather than the default share image.

### Showcase Cards

* Author links can go to their filtered page (rather than what was entered in the form)?
* Handle video titles that are cut-off
* new design over 2 lines?
* truncate with "..."?
* other ideas?
*

We can use this as a discussion thread and break things out into individual pull requests / issues as needed. Any other thoughts or comments?