feat!: Introduce `navbar_options()` #2939

Job	Run time
routine / routine	8m 54s
website / pkgdown	7m 35s
R-CMD-check / setup	9s
R-CMD-check / macOS-latest (4.4.2)	2m 32s
R-CMD-check / windows-latest (4.4.2)	3m 54s
R-CMD-check / ubuntu-latest (devel)	2m 41s
R-CMD-check / ubuntu-latest (4.4.2)	2m 16s
R-CMD-check / ubuntu-latest (4.3.3)	2m 12s
R-CMD-check / ubuntu-latest (4.2.3)	2m 30s
R-CMD-check / ubuntu-latest (4.1.3)	2m 48s
R-CMD-check / ubuntu-latest (4.0.5)	2m 26s
Deploy to shinyapps.io	0s
	37m 57s

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