Pull Request Template: Add a Conference or Workshop

Thank you for contributing! Most PRs are to add a new conference or workshop. The following are to help ensure you've added everything correctly:

Conference/Workshop Details

• Name, Location, Date(s), Website URL and Status are required
• X / Twitter is Optional
• Location should be City + Country or Online
• Status can include information about registration, pricing, calls for proposals and can include links to all the above.

Checklist

• I have added the conference/workshop to the correct YAML file (_data/current.yml or _data/past.yml)
• The entry includes name, location, date(s), url and accurate status
• The entry is in chronological order (soonest to furtherest away)
• If there are any special characters in the name field (: or ; or '), the name must be in quotes (")
• I have checked for duplicates to avoid listing the same event twice
• Build runs successfully

Additional context

This PR adds ICS calendar generation support and includes generated conference events in calendar.ics.

It also fixes iCalendar line folding in tools/generate_calendar_ics.rb to ensure RFC-compliant physical line lengths (75 octets, including continuation lines), which improves compatibility with calendar clients during import.

Additionally, the production deploy workflow now runs ruby tools/generate_calendar_ics.rb and stages calendar.ics in the automated commit step so the ICS file stays updated on each production build.

Validation run:

• bundle exec jekyll build --verbose
• bundle exec htmlproofer ./_site --check-html --disable-external
• Parallel validation (Code Review + CodeQL) passed with no findings.