According to https://github.com/twbs/bootstrap/issues/10547 it's not
possible to have the trigger defined on the delegated element, i.e. not
defined as a data attribute.

fixed duplication of code

correctly position the arrow
fix scss lint

Closes #34026

[ci skip]

MR: !12468

move webpack publicPath setup earlier in the bootstrap processes to avoid ES module execution order issues

removed random colors left over from the original nav

Start of the new navigation by redesigning just the top navigation menu.
This is only shown when a cookie is set.

Part of #32794