Add the "Heat conduction in a 2D rhomboid fin" tutorial at the right banner

Author: nikoscham

assets/heat-conduction-2d-fin-results.png

@@ -151,6 +151,14 @@ <h1 class="top">
         Heat conduction in a 2D fin
         <a href="https://feascript.com/tutorials/heat-conduction-2d-fin.html">tutorial</a>
       </p>
+      <img
+        src="./assets/heat-conduction-2d-rhomboid-fin-results.png"
+        alt="Results of heat conduction in a 2D rhomboid fin tutorial"
+      />
+      <p class="image-caption">
+        Heat conduction in a 2D rhomboid fin
+        <a href="https://feascript.com/tutorials/heat-conduction-2d-rhom-fin-gmsh.html">tutorial</a>
+      </p>
       <img
         src="./assets/heat-conduction-1d-wall-results.png"
         alt="Results of heat conduction through a wall tutorial"