add logo (#1144) #3014

Job	Run time
routine / routine	8m 12s
website / pkgdown	9m 0s
R-CMD-check / setup	59s
R-CMD-check / macOS-latest (4.4.2)	3m 33s
R-CMD-check / windows-latest (4.4.2)	4m 7s
R-CMD-check / ubuntu-latest (devel)	3m 3s
R-CMD-check / ubuntu-latest (4.4.2)	2m 25s
R-CMD-check / ubuntu-latest (4.3.3)	2m 25s
R-CMD-check / ubuntu-latest (4.2.3)	3m 3s
R-CMD-check / ubuntu-latest (4.1.3)	2m 44s
R-CMD-check / ubuntu-latest (4.0.5)	2m 32s
Deploy to shinyapps.io	14m 50s
	56m 53s

Provide feedback