Change intro text to consistently use header class as the background color.

pages/apps.php

@@ -14,7 +14,7 @@
 		</div>
 		<!-- TBD/TODO: Add image? Me at laptop with Cleo? Or none like other Media pages? -->
 		<div class="row">
-			<div class="col-12 text">
+			<div class="col-12 header">
 				<p>
 					I'm a professional software engineer who's been playing with
 					Linux system administration from a young age.