Optimize PNG and JPEG Images

[FazlyMR]

This is related to issue #36, but with some differences:

• This also optimizes JPEG image(s), including one PNG image that was a JPEG image, which is reconverted to JPEG.
• PNG images with transparent background are filled with the same color used in the website since indexed color does not properly support alpha channel (as far as I know).
• PNG images have their Total Unique Colors (TUCs) reduced to a number following this calculation: ((TUC/8)+(TUC/9))/2 instead of the reduction factor said in the aforementioned issue.

With this optimization, the file size of the entire library of images from chapters 0 to 7 are reduced from ~3MBs to ~700KBs.

Originals are included inside the new "originals" directory.

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