Art request - Merch store collection header

[corywatilo]

Merch store feels a bit abrupt. Would be nice to have a short header at the top - maybe something around this size.

We'll also need a mobile version. In this quick hack I did, it comes out to 375x185 which seems like a reasonable aspect ratio.

We could do something as simple as overlaying a few products through the header on some sort of background or go full on illustration like you're inside an actual physical PostHog merch fashion boutique (with racks of shirts, etc).

[lottiecoxon]

Tagged you in Figma file!