Docs: Reencode number overlay images as full rgb+alpha
By default, optipng reduces pngs with very few colors to using a palette. That happens also for images with alpha channel. Some tools do not support palette+alpha well, though. The images in this change were re-saved as 24-bit version and then optimized via optipng using the "-nx" option, which prevents color reductions. Change-Id: Ib6f04c64724913ea02fcaa442a914b6b79b92a55 Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
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