Add viewport and utf8 meta tags

app/views/shared/_head.html.erb

@@ -1,4 +1,7 @@
-<title>Hey</title>
+<title>Spark</title>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
+
 <%= csrf_meta_tags %>
 <%= stylesheet_link_tag    'application', media: 'all', 'data-turbolinks-track': 'reload' %>
 <%= javascript_include_tag 'application', 'data-turbolinks-track': 'reload' %>