Expand schema.org metadata

[vkrause]

• Add type for the location property.
• Add location name and event description.
• Provide address as machine-readable parts rather than a single string.

[thomersch]

This looks great, thanks! I am away from keyboard for a few days, I set myself a reminder to review it next week

[thomersch]

LGTM, I just formatted the file so it's consistent. Merging & deploying now.

Thanks!