fix: Replace a photo_2

Author: che-so

post_4.html

@@ -34,7 +34,7 @@
             </div>
         </nav>
         <!-- Page Header-->
-        <header class="masthead" style="background-image: url('assets/img/post-bg.jpg')">
+        <header class="masthead" style="background-image: url('assets/img/medicine.jpg')">
             <div class="container position-relative px-4 px-lg-5">
                 <div class="row gx-4 gx-lg-5 justify-content-center">
                     <div class="col-md-10 col-lg-8 col-xl-7">