Add Qr code to comment

[lredoban]

[rossjrw]

Oh, this is a really good idea. I'm into this.

I changed how the comment looks in #97 which will add a bit more space for the image, but I'd still like to make it a bit smaller, plus maybe some sort of size optimisation based on how long the URL is (the example size you've given could probably be smaller for short URLs, maybe it's too small for really big URLs).

https://goqr.me/api/ seems to be the operating site for qrserver.com, and their ToS is nonexistent so I'm not comfortable including it in this project. But it could be worth finding an alternative or just generating it on the runner.

[lredoban]

You're totally right for qrserver.com, I've made some changes to generate the QR code with https://github.com/unjs/uqr.
But as github comments don't handle base64 images I have to put it inside a code block.
I put all this inside a "details" tag so it doesn't take space.

Let me know if I need to make some changes