Image hotlinking from the forum keeps breaking

[dreeves]

I just had to change a bunch of URLs from things like this:

https://global.discourse-cdn.com/flex019/uploads/beeminder/original/2X/8/8e2e5d6e2098a94de841d7048548664f23cee758.png

to thinks like this:

https://us1.discourse-cdn.com/flex019/uploads/beeminder/original/2X/8/8e2e5d6e2098a94de841d7048548664f23cee758.png

I think this happens again and again that Discourse, maybe intentionally, breaks old image hotlinks. So we should just move those to GitHub.

Example blog post affected:
https://blog.beeminder.com/paretocaps

Verbata: images, image hotlinking, image hosting, discourse,