Remove puzzle icon and update FEAScript platform link with emoji enhancements for better visual appeal in index.html

Author: nikoscham

assets/puzzle_icon.ico

@@ -87,14 +87,7 @@ <h1>A JavaScript Finite Element Simulation Library</h1>
       </li>
 
       <li>
-        <a href="https://platform.feascript.com/" target="_blank">
-          FEAScript platform
-          <img
-            src="./assets/puzzle_icon.ico"
-            alt="Puzzle Icon"
-            style="width: 15px; height: 15px; vertical-align: middle; margin-left: 2px; margin-bottom: 4px"
-          />
-        </a>
+        <a href="https://platform.feascript.com/" target="_blank"> FEAScript platform 🧩 </a>
       </li>
       <li>
         <a href="https://github.com/FEAScript/" target="_blank">
@@ -211,13 +204,13 @@ <h2 id="features"><a name="Features"></a>Features</h2>
     <p>The following lists contain some, but not all, of the available features in FEAScript:</p>
     <ul>
       <li>
-        <strong>Physical Modelling</strong>
+        🧠 <strong>Physical Modelling</strong>
         <ul>
           <li>Solid heat conduction solver</li>
         </ul>
       </li>
       <li>
-        <strong>Geometry and Meshing</strong>
+        📐 <strong>Geometry and Meshing</strong>
         <ul>
           <li>Simple mesh generation (1D and rectangular 2D domains)</li>
           <li>
@@ -241,7 +234,7 @@ <h2 id="features"><a name="Features"></a>Features</h2>
         </ul>
       </li>
       <li>
-        <strong>Numerical Solution</strong>
+        ⚙️ <strong>Numerical Solution</strong>
         <ul>
           <!--
           <li>
@@ -257,13 +250,13 @@ <h2 id="features"><a name="Features"></a>Features</h2>
         </ul>
       </li>
       <li>
-        <strong>Parallelization</strong>
+        📊 <strong>Parallelization</strong>
         <ul>
           <li>Web worker support for multi-threaded computation</li>
         </ul>
       </li>
       <li>
-        <strong>Visualization</strong>
+        📈 <strong>Visualization</strong>
         <ul>
           <li>Line and surface plotting</li>
         </ul>