Replace microdata to json-ld

[Michal-Dziedzinski]

Related Issues

closes #3704

Short Description and Why It's Useful

Replace microdata to json-ld which is the recommended by Google.

Which Environment This Relates To

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing Vue Storefront sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and Currently Important Rules Acceptance

• I read and followed contribution rules

[gibkigonzo]

Hey 😄 wdyt about moving all of those functions to separate file as helpers?
We could expose there:

• export function reviewJsonLd({review})
• export function productJsonLd({product, configuration, attributes, storeView})

and rest keep as local functions:

• function getMaterials(material)

also I think we can now remove structuredData and just get availability in helper 🤔

[andrzejewsky]

@Michal-Dziedzinski Looks really good, one thing - did you test it with some validator ? eg: https://json-ld.org/playground/ (if document generated by product page is correct)

[Michal-Dziedzinski]

@Michal-Dziedzinski Looks really good, one thing - did you test it with some validator ? eg: https://json-ld.org/playground/ (if document generated by product page is correct)

no, but after checking it turned out that I have to add a few fields to the object with reviews, so I added them :)

[andrzejewsky]

@Michal-Dziedzinski please resolve conflict here and it will be ready for merge ;)

[Michal-Dziedzinski]

@andrzejewsky resolved ;)