Update license link in HeatConduction2DFin example to point to FEAScript-core repository

Author: nikoscham

examples/solidHeatTransferScript/HeatConduction2DFin/HeatConduction2DFin.html

@@ -43,7 +43,7 @@ <h1>Heat Conduction in a Two-Dimensional Fin Example</h1>
 
     <p>
       FEAScript is distributed under the terms of the
-      <a href="https://opensource.org/license/mit" target="_blank">MIT license</a>. © 2024 FEAScript.
+      <a href="https://github.com/FEAScript/FEAScript-core/blob/main/LICENSE" target="_blank">MIT license</a>. © 2024 FEAScript.
     </p>
 
     <!-- FEAScript module and visualization -->