Fixes article seo structured data

[mabasic]

Fixes issue #127

Additional fixes:

• adds publisher field which is required by google
• modified regex to remove whitespace inside microdata but not within strings enclosed with ". This allows the microdata to be stripped of white spaces while still preserving description, headline and author name white spaces.
• prepended image with siteUrl
• location.href is undefined when running yarn build causing:

"mainEntityOfPage":{"@type":"WebPage","@id":"undefined"}

To solve this I have added a static query to fetch the site name (used in publisher) & siteUrl which I applied to appropriate places.

You can view the current state of structured data of Novela here

You can view the state of structured data on my blog with this PR

[brotzky]

Thanks @mabasic :)