Update footer links to https://jss.live/ #329

Summary

The auth-page footer in src/auth/middleware.js:387-389 still points to the old hosts. Update to canonical https://jss.live/.

Current

<p class="footer">
  Powered by <a href="https://sandy-mount.com">Sandymount</a> •
  <a href="https://solidproject.org">Learn about Solid</a>
</p>

Proposed

<p class="footer">
  Powered by <a href="https://jss.live/">JSS</a> •
  <a href="https://jss.live/docs/">Docs</a>
</p>

Why

• jss.live is now the canonical project home and docs hub
• Aligns with the LWS-aligned positioning announced on public-solid (April 23)
• Removes orphaned references to hosts that are no longer the primary identity
• Keeps the footer compact and project-focused

Scope

• Just the auth-page footer (login/401/403 templates)
• Single file change (src/auth/middleware.js)
• No behavioural changes

Related

• jss.live is the canonical home referenced in JSS docs and announcements
• See also JavaScriptSolidServer/docs#1 (architectural docs) for the broader docs structure