fix: remove broken indigenous-data.com link

The https://www.indigenous-data.com/ link is no longer valid.
Removed from Resources & Further Reading section on values page.

Remaining resources:
- Te Mana Raraunga – Māori Data Sovereignty Network
- CARE Principles for Indigenous Data Governance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

public/about/values.html

@@ -301,12 +301,6 @@
             </a>
             <p class="text-sm text-gray-600 mt-1">International framework for indigenous data rights.</p>
           </li>
-          <li>
-            <a href="https://www.indigenous-data.com/" class="text-blue-600 hover:text-blue-700 font-medium" target="_blank" rel="noopener">
-              Research Data Alliance - Indigenous Data Interest Group →
-            </a>
-            <p class="text-sm text-gray-600 mt-1">Global collaboration on indigenous data sovereignty.</p>
-          </li>
         </ul>
       </div>
     </section>