🎩 What? Why?

This PR implements the schema.org Event specification in Meetings, so it's easier for external tools and services (such as Google) to interpret this data.

I followed is in https://developers.google.com/search/docs/appearance/structured-data/event?hl=en

Note that there are a few warnings of optional fields:

• performer: it does not apply to Decidim use case
• offers: it does not apply to Decidim use case
• image: I implemented it but even if I add attachments images, it still gives a warning as the URL is invalid in localhost.

📌 Related Issues

• Fixes #13245

Testing

1. Create three meetings of different types: in person, online and hybrid
2. Check out the source code of the page and search for "ld+json"
3. Copy the code and paste it in the "Rich Results Test": https://search.google.com/test/rich-results

Example of the rich results: https://search.google.com/test/rich-results/result/r%2Fevents?id=xmfa3OtCoI2dlGCPFUnViw

📷 Screenshots

♥️ Thank you!