feat!: Introduce `navbar_options()` #2942

Job	Run time
website / pkgdown	7m 26s
R-CMD-check / setup	8s
routine / routine	8m 31s
R-CMD-check / macOS-latest (4.4.2)	2m 25s
R-CMD-check / windows-latest (4.4.2)	3m 29s
R-CMD-check / ubuntu-latest (devel)	2m 15s
R-CMD-check / ubuntu-latest (4.4.2)	2m 36s
R-CMD-check / ubuntu-latest (4.3.3)	2m 15s
R-CMD-check / ubuntu-latest (4.2.3)	2m 22s
R-CMD-check / ubuntu-latest (4.1.3)	2m 22s
R-CMD-check / ubuntu-latest (4.0.5)	2m 22s
Deploy to shinyapps.io	0s
	36m 11s

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