Update index.html

Author: JCinnamon

index.html

@@ -682,7 +682,7 @@ <h3>Colour Visualizer</h3>
           <span class="tool-arrow">Open tool &rarr;</span>
         </a>
 
-        <a href="https://jcinnamon.github.io/colour-map/" class="tool-card">
+        <a href="https://github.com/JCinnamon/earthcolours" class="tool-card">
           <div class="tool-icon">🗺️</div>
           <h3>Colours Map &amp; Earth Palette Generator</h3>
           <p>Explore Earth colours and generate palettes through an interactive map that connects colour and place.</p>