Support for menu description.

[grig-23]

Is your feature request related to a problem? Please describe.

Currently, Storefront theme does not support menu descriptions.

Describe the solution you'd like

Add the support for menu descriptions.

Additional context

1. Head to wp-admin >> Appearance >> Menus
2. In the "Screen options" at the top, tick the "descriptions" checkbox.
3. Add descriptions to some menu items. That won't work.

Screenshot direct link: https://d.pr/i/oROi8H

Reported in 26823683-hc

[gigitux]

We decided to revert #1711 because we noticed that:

• on the secondary menu, the menu, and the sub-menu are bottom aligned instead of top-aligned. Fixed with Add support for sub menu description #1943
• on the mobile, the menu doesn’t look very well (“description” should be gray and there is too much margin).