Add nyan-cat easter egg

templates/MainNavBar.php

@@ -20,12 +20,13 @@ class MainNavBar extends NavBar
 		// Select a random space invader, with a bias towards the mascot
 		$rnd = rand(0, 100);
 		$alt = $rnd > 50 ? ' alt-' . ($rnd % 6 + 1) : '';
+		$className = $rnd > 5 ? 'space-invader' . $alt : 'nyan-cat';
 
 		echo '
 		<nav id="', $this->outerMenuId, '" class="navbar navbar-expand-lg ', $this->navBarClasses, '" aria-label="', $this->ariaLabel, '">
 			<div class="container">
 				<a class="navbar-brand flex-grow-1" href="', BASEURL, '/">
-					<i class="space-invader', $alt, '"></i>
+					<i class="', $className, '"></i>
 					HashRU Pics
 				</a>
 				<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#', $this->innerMenuId, '" aria-controls="', $this->innerMenuId, '" aria-expanded="false" aria-label="Toggle navigation">