Unify label styling by replacing hero-label with section-label and comment out portfolio CTA section

includes/cs_header.php

@@ -27,7 +27,7 @@ require __DIR__ . '/header.php';
 </div>
 
 <header class="hero">
-	<div class="hero-label">Case Study — <?= htmlspecialchars($p['num']) ?></div>
+	<div class="section-label">Case Study — <?= htmlspecialchars($p['num']) ?></div>
 	<h1><?= htmlspecialchars($p['h1'][0]) ?><br><span class="h1-sub"><?= htmlspecialchars($p['h1'][1]) ?></span></h1>
 	<p class="hero-sub"><?= htmlspecialchars($p['sub']) ?></p>
 	<ul class="cs-meta-bar">