[enh] viewport meta added

searx/templates/base.html

@@ -4,6 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="description" content="Searx - a privacy-respecting, hackable metasearch engine" />
     <meta name="keywords" content="searx, search, search engine, metasearch, meta search" />
+    <meta name="viewport" content="width=device-width, maximum-scale=1.0, user-scalable=1" />
     <title>{% block title %}{% endblock %}searx</title>
     <link rel="stylesheet" href="/static/css/style.css" type="text/css" media="screen" />
     <link rel="shortcut icon" href="{{ url_for('static', filename='img/favicon.png') }}" />