Update index.html

Author: JCinnamon

index.html

@@ -682,7 +682,7 @@ <h3>Image Colour Visualizer</h3>
           <span class="tool-arrow">Open tool &rarr;</span>
         </a>
 
-        <a href="https://github.com/JCinnamon/earth-colours-mapper" class="tool-card">
+        <a href="https://jcinnamon.github.io/earth-colours-mapper/" class="tool-card">
           <div class="tool-icon">🗺️</div>
           <h3>Earth Colours - an Interactive Map + Palette Generator</h3>
           <p>Explore the geographies of colour and generate Earth colour palettes for mapping and graphic design.</p>