feat: improve SEO with podcast JSON-LD, canonical and meta descriptions

categories.php

@@ -43,6 +43,8 @@ if ($categoryId && isset($allCategories[$categoryId])) {
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta name="csrf-token" content="<?php echo generateCSRFToken(); ?>">
     <title><?php echo htmlspecialchars($categoryName); ?> - <?php echo SITE_NAME; ?></title>
+    <meta name="description" content="Découvrez toutes les vidéos de la catégorie <?php echo htmlspecialchars($categoryName); ?> sur <?php echo SITE_NAME; ?>. Contenu multimédia de qualité et exclusif.">
+    <link rel="canonical" href="<?php echo getBaseUrl() . '/categories.php?id=' . $categoryId; ?>">
     <link rel="stylesheet" href="css/styles.css?v=<?php echo filemtime('css/styles.css'); ?>">
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/7.0.1/css/all.min.css">
 
@@ -52,7 +54,7 @@ if ($categoryId && isset($allCategories[$categoryId])) {
     <link rel="icon" type="image/png" sizes="16x16" href="img/favicon-16x16.png">
     <link rel="manifest" href="site.webmanifest">
     <link rel="icon" type="image/x-icon" href="img/favicon.ico">
-    <meta name="theme-color" content="#ffffff">
+    <meta name="theme-color" content="#FF0000">
     
     <!-- Open Graph Meta Tags -->
     <meta property="og:title" content="Catégorie : <?php echo htmlspecialchars($categoryName); ?> - <?php echo SITE_NAME; ?>">
@@ -112,7 +114,7 @@ if ($categoryId && isset($allCategories[$categoryId])) {
                 <div class="section-logo">
                     <img src="img/logo.png" alt="<?php echo SITE_NAME; ?>">
                 </div>
-                <h2 class="section-title">Catégorie : <?php echo htmlspecialchars($categoryName); ?></h2>
+                <h1 class="section-title">Catégorie : <?php echo htmlspecialchars($categoryName); ?></h1>
             </div>
 
             <?php if (empty($videos)): ?>