Update HeatConduction1DWall.png and enhance tutorial content

Author: nikoscham

assets/HeatConduction1DWall.png

@@ -91,18 +91,18 @@ <h1>Heat Flow Through a Wall</h1>
 
     <h2 id="mathematicalformulation"><a name="Mathematical formulation"></a>Mathematical Formulation</h2>
     <p>
-      <img src="../assets/HeatConduction1DWall.png" width="150" />
+      Steady heat conduction in one dimension is described by the Laplace equation: \(\frac{d^2T}{dx^2} = 0\),
+      where \(T\) signifies the temperature values. The above is used to find the temperature distribution
+      within common engineering components like house walls.
     </p>
 
+    <img src="../assets/HeatConduction1DWall.png" width="150" />
+
+    <p>The above schematic illustrates the problem domain and outlines the associated boundary conditions.</p>
+
     <h2 id="solvingwithfeascript"><a name="Solving with FEAScript"></a>Solving with FEAScript</h2>
-    <p>
-      <!-- ... -->
-    </p>
 
     <h2 id="results"><a name="Results"></a>Results</h2>
-    <p>
-      <!-- ... -->
-    </p>
 
     <!-- Container element where the solution plot will be rendered -->
     <div id="orientation-message">