website: better meta tag for mobile

fixes the "dual scroll" problem, among other things.

Change-Id: Ic1d56360859e6adb271e39c5300fd002c7a08fd2
diff --git a/templates/partials/head.mustache b/templates/partials/head.mustache
index 0cbfe61..7265013 100644
--- a/templates/partials/head.mustache
+++ b/templates/partials/head.mustache
@@ -1,6 +1,6 @@
 <head>
   <meta charset="utf-8">
-  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no">
 
   <title>{{# page.title }}{{ page.title }} - {{/ page.title }}Vanadium</title>