Clarify navigation vs superfooter rules for new pages

[Copilot]

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

• Issue summary

  • Contribution guidance did not clearly separate when new pages belong in main/sub navigation vs elsewhere.
  • This update clarifies that nav placement requires maintainer confirmation, while superfooter inclusion is required for all pages.

• Documentation update

  • Added a new section in CONTRIBUTING.md: “Adding or Updating Site Pages”.
  • Added explicit rule: do not automatically add new pages to _includes/nav.html.
  • Added explicit rule: add all pages to the superfooter in _includes/footer.html.

• Example snippet

  ### 4. Adding or Updating Site Pages
  - **Main/Sub Navigation:** Do not automatically add new pages to `_includes/nav.html`. Confirm with a maintainer first.
  - **Superfooter:** Add all pages to the superfooter in `_includes/footer.html`.