Could we move all images into one directory?

[AndreMouche]

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Could we move all images into one directory? By the way, png is big, could we convert it to jpg to speed up the page loading?

[Hoverbear]

PNG is better for our users since it can support transparency. This is useful since the theme of mdbook is changable. Since we're primarily using simple diagrams PNG isn't that terrible. :) If you are unsatisfied with this please open a new issue. Let's limit this issue to the 'one directory' point.

Does this proposal suggest having, for example, an /img/ directory which subdirectories for each chapter? I'm not convinced this brings any real gains.