update required ruby version to >= 3.2

[untra]

🔤 Polyglot PR

• build tickle, next release of polyglot will require updated (and still eol'd) ruby 3.2 runtime due to incremental security updates
• adds a missing referenced atom.xml rss feed page
• fixes htmlproofer linting mistakes now activated properly in cicd

Type of change

• Docs update (changes to the readme or a site page, no code changes)
• Ops wrangling (automation or test improvements)
• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Sweet release (needs a lot of work and effort)
• Something else (explain please)

Checklists

• If modifying code, at least one test has been added to the suite