feat!: Introduce `navbar_options()` #2937

Job	Run time
website / pkgdown	6m 16s
routine / routine	7m 47s
R-CMD-check / setup	6s
R-CMD-check / macOS-latest (4.4.2)	3m 34s
R-CMD-check / windows-latest (4.4.2)	3m 36s
R-CMD-check / ubuntu-latest (devel)	2m 16s
R-CMD-check / ubuntu-latest (4.4.2)	2m 32s
R-CMD-check / ubuntu-latest (4.3.3)	2m 32s
R-CMD-check / ubuntu-latest (4.2.3)	2m 27s
R-CMD-check / ubuntu-latest (4.1.3)	2m 39s
R-CMD-check / ubuntu-latest (4.0.5)	2m 41s
Deploy to shinyapps.io	0s
	36m 26s

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