Set maximum scale for viewport to avoid auto-zoom

Author: jkmassel

client/components/head/index.jsx

@@ -15,7 +15,7 @@ const Head = ( {
 
 			<meta charSet="utf-8" />
 			<meta httpEquiv="X-UA-Compatible" content="IE=Edge" />
-			<meta name="viewport" content="width=device-width, initial-scale=1" />
+			<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
 			<meta name="format-detection" content="telephone=no" />
 			<meta name="mobile-web-app-capable" content="yes" />
 			<meta name="apple-mobile-web-app-capable" content="yes" />