Add App Store-ready public support pages and metadata link

[Copilot]

This PR adds a minimal public support surface required for App Store submission: a reachable support page with contact path, Apple Health data-location statement, and links to privacy/support guidance. It also updates store metadata to point at the hosted support URL pattern for Vercel.

• Support page (/support/)

  • Added support/index.html as a static page suitable for Vercel hosting.
  • Includes:
    • contact form path (GitHub Issues link, explicitly labeled as external/account-required),
    • explicit statement that weight data lives in Apple Health (no separate app DB),
    • privacy policy link,
    • link to support instructions.

• Support instructions page (/support/instructions/)

  • Added support/instructions/index.html with concise export/deletion guidance.
  • Clarifies that Health export is full-dataset export (not LogWeight-only).

• App Store metadata alignment

  • Updated docs/AppStoreMetadata.md Support URL section to document the deploy target path:
    • https://<your-domain>/support/
    • with explicit reminder to replace the placeholder domain before submission.

<li>Data location: your body-weight data lives in Apple Health. LogWeight does not keep a separate weight database.</li>
<li>
  Privacy policy:
  <a href="https://github.com/Juuro/LogWeight/blob/main/docs/Privacy.md">
    Read the privacy policy (opens in GitHub)
  </a>
</li>

[Juuro]

@copilot Can you please add screenshots of the pages to the PR?

[Copilot]

@copilot Can you please add screenshots of the pages to the PR?

Done in c1a340a.

Added screenshots to the PR as tracked files:

• docs/support-screenshots/support-page.png
• docs/support-screenshots/support-instructions-page.png