Fix broken link.

Signed-off-by: Willy Sudiarto Raharjo <willysr@gmail.com>

courses.php

@@ -49,9 +49,9 @@ include "includes/navbar.html";
     <h1>Gasal 2023/2024</h1>
   </header>
   <ol>
-    <li><a href="cloud-infrastructure-ti/index.php">System Administration</a></li>
+    <li>System Administration</li>
-    <li><a href="kripto-ti/index.php">Cryptography</a></li>
+    <li>Cryptography</li>
-    <li><a href="manpro-ti/index.php">Project Management</a></li>
+    <li>Project Management</li>
     <li>Database Administration</li>
   </ol>
 </article>
@@ -134,9 +134,9 @@ include "includes/navbar.html";
     <h1>Gasal 2019/2020</h1>
   </header>
   <ol>
-    <li><a href="kakom-ti/index.php">Computer Security</a></li>
+    <li>Computer Security</li>
-    <li><a href="adminsis-ti/index.php">System Administration</a></li>
+    <li>System Administration</li>
-    <li><a href="os-ti/index.php">Operating System</a></li>
+    <li>Operating System</li>
   </ol>
 </article>
 <article>
@@ -249,7 +249,7 @@ include "includes/navbar.html";
   <ol>
     <li>Project Management</li>
     <li>Operating System</li>
-    <li>Computer Technology</li>    
+    <li>Computer Technology</li>
     <li>Final Year Project 1 (IDDIT)</li>
   </ol>
 </article>
@@ -260,7 +260,7 @@ include "includes/navbar.html";
   <ol>
     <li>Network Administration</li>
     <li>Computer Security</li>
-    <li>Computer Technology</li>    
+    <li>Computer Technology</li>
     <li>Principles of Project Management &amp; Quality Assurance (IDDIT)</li>
     <li>Final Year Project 1 (IDDIT)</li>
   </ol>
@@ -315,7 +315,7 @@ include "includes/navbar.html";
     <li>Software Engineering II</li>
     <li>Project Management</li>
     <li>Data Warehouse (IDDIT)</li>
-    <li>Principles of IT Project Management and Quality Assurance (IDDIT)</li>    
+    <li>Principles of IT Project Management and Quality Assurance (IDDIT)</li>
   </ol>
 </article>
 <article>