feat: add GNOME-style app icons #238
                
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Introduce new simplistic app icons, including symbolic and nightly-release variants, to better align with the GNOME Human Interface App Icon Guidelines, as discussed in #191.
The icons were designed from scratch in Inkscape 1 and exported using App Icon Preview, which also optimized the SVGs with svgo. Quack!
Any feedback is appreciated. I'd be happy to make some adjustments or even go back to the drawing board, if someone has a better idea than the cute little froggo :)
I'm also attaching my design file if anyone wants to make some modifications on their own: com.github.tenderowl.frog.svg
Footnotes
except the magnifying glass, adapted from GNOME Image Viewer's icon ↩