Add replacement image. Use png logo #98

Job	Run time
common-steps	1m 42s
build-flatpak	9m 51s
build-linux (pkg-appimage)	4m 7s
build-doxygen	2m 23s
build-windows (pkg-win)	7m 40s
build-linux (pkg-appimage-snapshot)	4m 20s
build-windows (pkg-win-snapshot)	7m 22s
build-linux (pkg-appimage-deployment)	4m 28s
build-windows (pkg-win-deployment)	7m 18s
deploySite	-1s
release	0s
	49m 10s

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