Replace skinning with laravel-theme

[nabeelio]

Much cleaner: https://github.com/igaster/laravel-theme
Does things basically the way I do, but better provisions and extensions of the theming engine. Shouldn't take many changes

resources

• https://laravel.com/docs/5.6/blade#service-injection
• https://laravel.com/docs/5.6/views#view-composers
• http://www.qcode.in/use-laravel-view-composer-to-share-data-in-partial-views/
• https://github.com/igaster/laravel-theme