book update

doc/LectureNotes/_build/html/chapter5.html

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    1. Elements of Probability Theory and Statistical Data Analysis
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="linalg.html">
+   2. Linear Algebra, Handling of Arrays and more Python Features
+  </a>
+ </li>
 </ul>
 <p class="caption collapsible-parent">
  <span class="caption-text">
@@ -206,6 +211,11 @@
    2. Building a Feed Forward Neural Network
   </a>
  </li>
+ <li class="toctree-l1">
+  <a class="reference internal" href="chapter11.html">
+   3. Solving Differential Equations  with Deep Learning
+  </a>
+ </li>
 </ul>
 
 </nav> <!-- To handle the deprecated key -->