Correct orientation of JPEGs with EXIF rotation

[earthboundkid]

See golang/go#4341 for details of the underlying problem, but in a nutshell, many common image editors avoid lossy recompression of JPEGs by setting an orientation flag in the EXIF metadata of the file. Unfortunately, Go's image/jpeg library still does not correctly handle this as of Go 1.12 beta, but it's a real pain if you have an image that "looks right" in Finder, Safari, etc. but is incorrectly oriented when processed by Hugo.

[bep]

#5181

[github-actions]

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