Release notes and feedback page for v12

Release drafting URL: https://webschemas.org/docs/releases.html#v12

Changes in Core section:

• Issue 2803 #2804 Add ineligibleRegion to MediaObject
• Update schema.ttl - Make duration property available on the Episode type #2821 Extend range of duration to Episode
• /isLiveBroadcast property has a typo (is -> if) #1417 Fix typo in isLiveBroadcast description
• mainEntityOfPage json-ld example needlessly differs from rdfa, microdata examples #2786 Updated JSON-LD example for mainEntityOfPage
• Proposal for adding BackOrder as an enumeration member of ItemAvailability #2651 added BackOrder as an enumeration member of ItemAvailability

• ...

Changes in Pending section:

• Property /marginOfError should have values of type /QuantitativeValue #2810 (bugfix)
• Proposal to add support for structured sizes and measurements #2811 Structured product sizes
• Add more enumerated aspects to HealthAspectEnumeration  #2799 HealthAspectEnumeration

Site

• Implementation of GitHub Actions based continuous integration tests  #2836 Implementation of GitHub Actions based continuous integration tests
• ambiguous use of '>' for property pages #2822 Update breadcrumb punctuation on property pages
• Fix broken href links #2789 Fix broken href links
• Tidy of directories #2800 Tidy of directory structure
• Migrate vocabulary definition and canonical URIs to HTTPS #2814 Migrate vocabulary definition and canonical URIs to HTTPS
• Fix links to release pages from releases page #2815 Fix links to release pages
• 404 Release Version web pages not available  #2805 (comment) 404s