Theme the tab bar in Safari 15 beta

Author: philwareham

_includes/head.html

@@ -10,6 +10,7 @@
 <link rel="apple-touch-icon" href="/apple-touch-icon.png">
 <link rel="manifest" href="/site.webmanifest">
 <meta name="color-scheme" content="dark light">
-<meta name="theme-color" content="#ffda44">
+<meta name="theme-color" content="#ffda44" media="(prefers-color-scheme: light)">
+<meta name="theme-color" content="#363d44" media="(prefers-color-scheme: dark)">
 <meta name="application-name" content="Textpattern CMS Documentation">
 <script defer src="https://textpattern.com/assets/js/app.js"></script>