* Generates JSON ld structured metadata from a product & appends to head
* Updated IProduct & IVariation interface
* Added IProductResponse & IProductsResponse interfaces
* Fixed sitemap urls having to many protocols
* Implemented jsonld for product w/ variations
* Aligned Product responses between backend & frontend
* PageMeta for updating head meta values: title & description
Use on any page where we want to display a unique meta page title &
description
* Set document language to norwegian
* Linting
