v5.2.2

Fixes

• width and height attributes are allowed on picture's sources (#490) by @johns996
• hgroup isn't obsolete, as per WHATWG (#489), as questioned by @davidbgk

Docs

• Upgrade to 11ty v3
• Display current release number in the sidebar (#488)
• Update WCAG and ARIA links (#479, #485) by @ThainBBdL

Chore

• Dependencies update