Better nav page with more frames

[smallplanetphantasmagoria]

• Investigate whether there are more frames to use for the nav page.
• If so, implement the frames on the nav page and investigate automatic cycling through them without reloading grid..
• If automatic cycling through the nav frames, stop on hover and reload the grid for the relevant frame.

[smallplanetphantasmagoria]

Done. This is implemented on the test page, with user interaction (except clickable areas) fully operational.

It will be put in place on the proper nav page once clickable areas are implemented fully.