Complete favicon support #142

Job	Run time
Build landingpage (generic-x86-64)	53s
Build landingpage (intel-nuc)	52s
Build landingpage (khadas-vim3)	1m 37s
Build landingpage (odroid-c2)	1m 29s
Build landingpage (odroid-c4)	1m 43s
Build landingpage (odroid-m1)	1m 33s
Build landingpage (odroid-n2)	1m 54s
Build landingpage (odroid-xu)	1m 37s
Build landingpage (qemuarm)	2m 25s
Build landingpage (qemuarm-64)	1m 46s
Build landingpage (qemux86)	42s
Build landingpage (qemux86-64)	40s
Build landingpage (raspberrypi)	1m 53s
Build landingpage (raspberrypi2)	1m 58s
Build landingpage (raspberrypi3)	2m 1s
Build landingpage (raspberrypi3-64)	1m 40s
Build landingpage (raspberrypi4)	1m 27s
Build landingpage (raspberrypi4-64)	1m 52s
Build landingpage (tinker)	1m 31s
Build landingpage (yellow)	2m 22s
Build landingpage (green)	1m 57s
	33m 52s

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