Quick image resizing and markdown image dimensions

@sam is working on this now so we should be able to get

image://vaLFE+HaBPe06ZIwhR6iqv64zE4.png

vs

//cdck-file-uploads-global.s3.dualstack.us-west-2.amazonaws.com/meta/original/3X/d/8/d813b1138aa816ad87eeeebf55af33ebf3c66cf0.png

which I, at least, view as a substantial quality of life improvement for day to day image handling in posts.

(note that we’ll need to use base62, to avoid the / and + chars in URLs though)

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