doc/site.css: Hide author field

Don't want to remove from metadata as it's useful for <meta> field and when generating man pages, so instead hide it with CSS

Author: daurnimator

doc/site.css

@@ -128,6 +128,9 @@ body > * {
     font-size: 1rem;
     line-height: 1.5rem
 }
+.author {
+    display: none
+}
 @media(min-width: 55rem) {
     .meta {
         position: fixed;