feat!: Introduce `navbar_options()` #2944

Job	Run time
R-CMD-check / setup	7s
website / pkgdown	8m 14s
routine / routine	10m 10s
R-CMD-check / macOS-latest (4.4.2)	2m 55s
R-CMD-check / windows-latest (4.4.2)	3m 46s
R-CMD-check / ubuntu-latest (devel)	2m 10s
R-CMD-check / ubuntu-latest (4.4.2)	2m 13s
R-CMD-check / ubuntu-latest (4.3.3)	2m 31s
R-CMD-check / ubuntu-latest (4.2.3)	2m 26s
R-CMD-check / ubuntu-latest (4.1.3)	2m 38s
R-CMD-check / ubuntu-latest (4.0.5)	2m 42s
Deploy to shinyapps.io	0s
	39m 52s

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