Fix broken navbar-collapse

templates/base.html

@@ -55,7 +55,7 @@
         <a class="navbar-brand" href="{{ SITEURL }}">
             <img id="logo" src="{{ SITELOGO }}" alt="{{ SITENAME }}">
         </a>
-        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbar-collapse" aria-controls="navbar-collapse" aria-expanded="false" aria-label="Toggle navigation">
+        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbar-collapse" aria-controls="navbar-collapse" aria-expanded="false" aria-label="Toggle navigation">
             <span class="navbar-toggler-icon"></span>
         </button>