feat: update popular-topics/webhooks

[dlchamp]

Expands on

guide.disnake.dev/popular-topics/webhooks

Title

Update the page at popular-topics/webhooks

Description

This page appears to still be marked as "WIP" and needs to be updated. The cats are cute, but it needs content. 😺

Additional context

No response

Would you like to implement this yourself?

Yes, I will be contributing this addition.