Update mobile theme colour

web/src/template.html

@@ -6,7 +6,7 @@
 
 		%sapper.base%
 
-		<meta name="theme-color" content="#2d3748">
+		<meta name="theme-color" content="#0a0d13">
 
 		<link rel="icon" type="image/png" href="favicon.png" />