fix the navigation

board.html

@@ -16,7 +16,9 @@
       <header>
         <!-- The sidebar naviagtion begins here -->
         <nav>
-          <?php include 'naviagtion.html';?>
+          <?php
+          include 'naviagtion.php';
+          ?>
         </nav>
         <!-- The sidebar naviagtion ends here --> 
       </header>

index.html

@@ -16,11 +16,9 @@
       <header>
         <!-- The sidebar naviagtion begins here -->
         <nav>
-          <ul>
-            <li><a href="ticket.html">Ticket</a></li>
-            <li><a href="board.html">Board</a></li>
-            <li><a class="active" href="index.html">Home</a></li>
-          </ul>
+          <?php 
+          include 'naviagtion.php';
+          ?>
         </nav>
         <!-- The sidebar naviagtion ends here -->
       </header>

ticket.html

@@ -16,7 +16,9 @@
       <header>
         <!-- The sidebar naviagtion begins here -->
         <nav>
-          <?php include 'naviagtion.html';?>
+          <?php
+          include 'naviagtion.php';
+          ?>
         </nav>
         <!-- The sidebar naviagtion ends here -->
       </header>