Add zAdmin wiki guide for annual team registration form rollover

[Copilot]

Adds a new admin-only wiki page documenting the yearly registration form rollover workflow, including response reset, re-linking to a new season sheet, and moving the sheet into the mentor-only season directory.

• What changed

  • Added a new page: zAdmin/Updating Team Registration Form.md.
  • Captured the requested end-to-end procedure as a numbered operational checklist.
  • Kept the section under top-level zAdmin so it sits at the bottom of the wiki nav.

• Content clarifications

  • Replaced ambiguous season folder placeholder with [YEAR] and explicit example (2026 Season Files).
  • Clarified the form source context (“current season mentor resources”).
  • Added explicit title format example for sheet creation ([YEAR] Team Registration).

• Example excerpt

  7. Set the title to the upcoming season (example: `[YEAR] Team Registration`).
  ...
  11. Choose `[YEAR] Season Files` → `_MENTOR ONLY - DO NOT SHARE`.
      - `[YEAR]` should be the current/upcoming season year (example: `2026 Season Files`).

• Fixes Updating team registration form #314

[Copilot]

Pull request overview

Adds a new zAdmin wiki page documenting the annual rollover procedure for the team registration Google Form, focusing on resetting responses, re-linking to a new season spreadsheet, and moving that spreadsheet into the mentor-only season folder.

Changes:

• Added an operational checklist for unlinking the old responses sheet, deleting responses, and linking a new sheet.
• Standardized the season placeholder to [YEAR] with an explicit example (2026 Season Files).

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