Update table_of_contents.html

Author: jcponce

content/table_of_contents.html

@@ -64,7 +64,7 @@
 
 <div class="fixed-bar" id="fixed-bar">
     <div class="link-container">
-        <a href="index.html" class="link" id="prev-link">
+        <a href="../index.html" class="link" id="prev-link">
             <span class="arrow"><i class="fa-solid fa-arrow-left"></i></span>
         </a>
         <span class="dark-mode-button" id="dark-mode-toggle"><i class="fa-regular fa-sun"></i></span>