Build website favicons locally #1329

Job	Run time
R-CMD-check / macOS-latest (release)	9m 55s
R-CMD-check / windows-latest (devel)	18m 12s
R-CMD-check / windows-latest (release)	19m 2s
R-CMD-check / windows-latest (oldrel)	17m 21s
R-CMD-check / windows-latest (4.1)	4m 9s
R-CMD-check / ubuntu-latest (devel)	2h 26m 40s
R-CMD-check / ubuntu-latest (release)	15m 42s
R-CMD-check / ubuntu-latest (4.3)	33m 47s
R-CMD-check / ubuntu-latest (4.2)	1m 9s
R-CMD-check / ubuntu-latest (4.1)	1m 14s
R-CMD-check / ubuntu-latest (4.0)	1m 9s
R-CMD-check / ubuntu-latest (3.6)	1m 10s
	4h 29m 30s

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