Extend and clarify documentation
Extend and clarify documentation

Make it more obvious how navbar menus and links interact with each other.
Casmo/cakephp3-bootstrap-helpers,Holt59/cakephp3-bootstrap3-helpers,ypnos-web/cakephp3-bootstrap-helpers,Holt59/cakephp3-bootstrap-helpers,raul338/cakephp3-bootstrap3-helpers