Quick image resizing and markdown image dimensions

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I know the technical reasons so I’m not expecting an easy solution, but I do find it sad that in such forward-looking software as Discourse, computerese like this is visible to the user at all.

![fat-city-apple-ii|690x473](//assets-meta-cdck-prod-meta.s3.dualstack.us-west-1.amazonaws.com/original/3X/e/7/e76d2a89947069f0ce624d5989fa20c47a13d383.png)

vs.

![fat-city-apple-ii|690x473](//assets-meta-cdck-prod-meta.s3.dualstack.us-west-1.amazonaws.com/original/3X/e/7/7v26IM9P2kmVepd7ZxuXyQ3.png)

is neither here nor there, really.