Richer metadata for pathways

[larsgw]

Metadata files (JSON-LD in WP0.md, WP0-info.json) could include some more info:

• Authors: full name & ORCID (from https://github.com/wikipathways/wikipathways.github.io/tree/main/_authors)
• Creation date
• URL (specifically WP0-info.json)

It would also be nice to make these files available from the site, either by hosting them in GitHub Pages or redirecting to their GitHub files (though note that https://raw.githubusercontent.com/ does not set content-type correctly).