Limit textarea field heading tag level

site/config/config.php

@@ -4,7 +4,8 @@ return [
     // Kirby configuration settings
     'home' => 'accueil',
     'panel' => [
-        'language' => 'fr'
+        'language' => 'fr',
+        'css' => 'assets/css/panel.min.css'
     ],
     // Meta Knight plugin options
     'diesdasdigital.meta-knight' => [
@@ -43,6 +44,10 @@ return [
                     'twitter_image' => $newPage->twitter_image()->value()
                 ]);
             }
+        },
+        'kirbytext:after' => function (string $text) {
+            // Replace any HTML <h1> or <h2> tag by <h3> tag after Markdown parsing
+            return preg_replace(['/<h1>|<h2>/', '/<\/h1>|<\/h2>/'], ['<h3>', '</h3>'], $text);
         }
     ],
     // Thumbnails and srcsets presets