Bugfix // Sort sections object, to not have the same order of nav-items as content-section

[ixisio]

Currrently if you change the order of nav-items, the plugin stops working. So a sort method helps to always forEach the sections ins the same order, regardless of its DOM position.

[playmono]

Thanks for this unmerged commit. You saved me hours and hours.

[ixisio]

@playmono Happy that I can help!