post: Is there a course on X

[cappe987]

The idea for this post came from a recent discussion in the Rust channel in the Discord server. I reused a cover image from another post, I hope that's ok. I can remove the joke about Boots if you want.

As I started making this PR I read the contributing guidelines and realized you don't want a wall of text, but I'll submit this now and if you don't like it I can try to rewrite it.