Random exhibit

[nic-hartley]

Goal

Allow users to browse randomly through the exhibits, to find new things.

Description

We should add an endpoint (maybe GET /exhibit/random) which acts like GET /exhibit/{id}, but picks a random exhibit and rendering it.

Alternatives

• Random feed -- This is significantly more work (either on frontend, backend, or both, depending on how it's done) and has inconsistent assumptions (should refreshing the page give you a new random page? What about going back to a previous page? etc.) which make it impossible to code objectively correctly.
• Not having it -- While it's certainly not mandatory by any stretch of the imagination, it's very little work and allows people to browse in a different, less structured way than just scrolling through a feed.

Additional notes

This can be done in 2 queries, if that, and only a few lines of code. It's pretty easy.