feat!: Introduce `navbar_options()` #2952

Job	Run time
routine / routine	5m 1s
website / pkgdown	5m 10s
R-CMD-check / setup	7s
R-CMD-check / macOS-latest (4.4.2)	3m 14s
R-CMD-check / windows-latest (4.4.2)	4m 14s
R-CMD-check / ubuntu-latest (devel)	2m 8s
R-CMD-check / ubuntu-latest (4.4.2)	2m 7s
R-CMD-check / ubuntu-latest (4.3.3)	2m 12s
R-CMD-check / ubuntu-latest (4.2.3)	2m 15s
R-CMD-check / ubuntu-latest (4.1.3)	2m 20s
R-CMD-check / ubuntu-latest (4.0.5)	2m 35s
Deploy to shinyapps.io	0s
	31m 23s

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