update logo PNGs

These are legit (paid) exports from placeit.net, to replace the previous demo
ones which had watermarks half-removed.

The formal PNG download images did not have the same "glow" effect on
the red "scholar" text, so I extracted from the browser base64 PNG as
before. Used gimp to "crop to selection", then cropped out the lowest
"start" background and saved. For small, resized to 200px, retaining
ratio.

Also ran both files through pngquant to reduce size; I can't visually
notice any artifacts or anything from this.

It is noticable that placeit.net changed the blue font and has less
"depth" to the 3D effect, which also makes the logo appear lighter
overall. Very noticble when flipping back and forth, don't think it is a
big deal otherwise.

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