feat!: Introduce `navbar_options()` #2935

Job	Run time
website / pkgdown	6m 19s
routine / routine	8m 14s
R-CMD-check / setup	8s
R-CMD-check / macOS-latest (4.4.2)	4m 58s
R-CMD-check / windows-latest (4.4.2)	4m 35s
R-CMD-check / ubuntu-latest (devel)	2m 37s
R-CMD-check / ubuntu-latest (4.4.2)	2m 33s
R-CMD-check / ubuntu-latest (4.3.3)	2m 34s
R-CMD-check / ubuntu-latest (4.2.3)	2m 42s
R-CMD-check / ubuntu-latest (4.1.3)	2m 46s
R-CMD-check / ubuntu-latest (4.0.5)	2m 41s
Deploy to shinyapps.io	0s
	40m 7s

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