Fix navbar active tracking for Bootstrap 5.

Author: maleadt

_layout/header.html

@@ -7,17 +7,17 @@
         </button>
         <div class="collapse navbar-collapse justify-content-center" id="navbarNav">
             <ul class=navbar-nav>
-                <li class="nav-item {{ispage index}}active{{end}}">
-                    <a class=nav-link href="/"><i data-feather=home></i> Home</a>
+                <li class="nav-item">
+                    <a class="nav-link {{ispage index}}active{{end}}" href="/"><i data-feather=home></i> Home</a>
                 </li>
-                <li class="nav-item {{ispage post/*}}active{{end}}">
-                    <a class=nav-link href="/post/"><i data-feather=file-text></i> News</a>
+                <li class="nav-item">
+                    <a class="nav-link {{ispage post/*}}active{{end}}" href="/post/"><i data-feather=file-text></i> News</a>
                 </li>
-                <li class="nav-item {{ispage showcases}}active{{end}}">
-                    <a class=nav-link href="/showcases/"><i data-feather=star></i> Showcases</a>
+                <li class="nav-item">
+                    <a class="nav-link {{ispage showcases}}active{{end}}" href="/showcases/"><i data-feather=star></i> Showcases</a>
                 </li>
-                <li class="nav-item {{ispage learn}}active{{end}}">
-                    <a class=nav-link href="/learn/"><i data-feather=book-open></i> Learn</a>
+                <li class="nav-item">
+                    <a class="nav-link {{ispage learn}}active{{end}}" href="/learn/"><i data-feather=book-open></i> Learn</a>
                 </li>
                 <li class="nav-item dropdown">
                     <a class="nav-link dropdown-toggle {{ispage backends/*}}active{{end}}" href="#" id="backendDropdown"