Add AI top-level filter

[gkulin]

We should add a top-level filter for AI samples.

It can be a temporary showcase and for easiest discoverability I'm thinking we can add it here:

We can potentially add it as a special tag like "popular" and "new":

or just have it added near the bottom of the card where the rest of the tags are

[hemarina]

Talked to Grace and we would use "Artificial Intelligence" tag in topic to filter all ai related template.