Fix admin form actions and redirects: replace & with ? for query parameters

admin/templates/pages/content-edit.php

@@ -2,7 +2,7 @@
 
 <div class="card shadow-sm">
     <div class="card-body">
-        <form method="POST" action="/admin/content-edit&file=<?= urlencode($file) ?>" id="editor-form">
+        <form method="POST" action="/admin/content-edit?file=<?= urlencode($file) ?>" id="editor-form">
             <input type="hidden" name="csrf_token" value="<?= $csrf ?>">
             <div class="row mb-3">
                 <div class="col-md-4">
@@ -48,7 +48,7 @@
                 <button type="submit" class="btn btn-primary">
                     <i class="bi bi-check-lg"></i> Opslaan
                 </button>
-                <a href="/admin/content&dir=<?= urlencode(dirname($file)) ?>" class="btn btn-outline-secondary" id="back-btn">Terug</a>
+                <a href="/admin/content?dir=<?= urlencode(dirname($file)) ?>" class="btn btn-outline-secondary" id="back-btn">Terug</a>
             </div>
         </form>
     </div>