perf: optimize pngs

[Commenter25]

Description from secureblue/secureblue.dev#346 applies to this as well 😄

With one exception: In the second commit, I ran it again with --alpha/-a, which checks for 100% transparent pixels, and removes the invisible color data. This does not affect how the image appears, and shouldn't affect anything unless something is pulling a Spore. That said, it is technically a lossy operation, so I wanted to point it out and make it easy to revert just in case.

The previous PR had no transparent images, so this flag did not apply. In this case, it's the opposite, all of them have transparency.

Without --alpha:

Input size: 827 KiB (846742 bytes)
Output size: 597 KiB (611500 bytes)
Total saved: 230 KiB (27.78%)

Running again with --alpha:

Input size: 597 KiB (611500 bytes)
Output size: 586 KiB (600269 bytes)
Total saved: 11.0 KiB (1.84%)

[codacy-production]

Up to standards ✅

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[RoyalOughtness]

With changes this insignificant, might as well leave them unchanged

[Commenter25]

why? /genq