Update navbars example to include a centered nav with utilities

[mdo]

Addresses #36486.

[SamuelMiller]

Please also provide an example of a true-center navbar following the format of navbarTogglerDemo02 (ttps://getbootstrap.com/docs/5.2/components/navbar/#content) where only the menu and right-align item collapses, not the navbar-brand as well.

Also, see my codepen example for a potentially different approach to center the menu, using flex-1 on both left and right items only using the BS class "col" without specifying a number suffix. #36486 (comment)

[julien-deramond]

This new example LGTM! Just a proposal to change the aria-label.
IDK if adding another example where only the menu and right-align item collapses and not the navbar-brand is relevant.

[SamuelMiller]

Also, see my codepen example for a potentially different approach to center the menu, using flex-1 on both left and right items only using the BS class "col" without specifying a number suffix. #36486 (comment)

I have provided a Codepen of this approach applied to a Bootstrap navbar. See comment, #36486 (comment)