style: center hero

- it's better for the clipped logo to disappear completely than the container interfering
  with the menu.

Author: jimmac

static/style.css

@@ -464,7 +464,7 @@ p > .btn { margin: .5rem .5rem 0 0; }
 
 .hero.landing {
   background-image: url('/img/hero-bg.webp');
-  background-position: center bottom;
+  background-position: center;
   background-size: cover;
   background-repeat: no-repeat;
   aspect-ratio: 21 / 9;