Issue description

In Bootsrap 5.3 there is a third style for tabs, other than tabs and pills: undeline.

• components: Nav
• bootstrap version #5.

What is happening?

Nav component already has properties to choose pills and tabs.

What should be happening?

Nav component should have an underline property to activate .nav-underline CSS class.

The component should also check that only one of these attribute to be truthy at a time, because it may cause issues to have a <Nav tabs pills ... /> in the layout.