[enh] archive.org link added to results

searx/static/default/css/style.css

 .result{margin:19px 0 18px 0;padding:0;clear:both}
 .result_title{margin-bottom:0}.result_title a{color:#2980b9;font-weight:normal;font-size:1.1em}.result_title a:hover{text-decoration:underline}
 .result_title a:visited{color:#8e44ad}
+.cache_link{font-size:10px !important}
 .result h3{font-size:1em;word-wrap:break-word;margin:5px 0 1px 0;padding:0}
 .result .content{font-size:.8em;margin:0;padding:0;max-width:54em;word-wrap:break-word;line-height:1.24}
-.result .url{font-size:.8em;margin:3px 0 0 0;padding:0;max-width:54em;word-wrap:break-word;color:#c0392b}
+.result .url{font-size:.8em;margin:0 0 3px 0;padding:0;max-width:54em;word-wrap:break-word;color:#c0392b}
 .result .published_date{font-size:.8em;color:#888;margin:5px 20px}
 .engines{color:#888}
 .small_font{font-size:.8em}

searx/static/default/less/style.less

 	}
 }
 
+.cache_link {
+    font-size: 10px !important;
+}
+
 .result {
 	h3 {
 		font-size: 1em;
 
 	.url {
 		font-size: 0.8em;
-		margin: 3px 0 0 0;
+		margin: 0 0 3px 0;
 		padding: 0;
 		max-width: 54em;
 		word-wrap:break-word;

searx/templates/default/result_templates/default.html

 
   <div>
     <h3 class="result_title"><a href="{{ result.url }}">{{ result.title|safe }}</a></h3>
+    <p class="url">{{ result.pretty_url }} <a class="cache_link" href="https://web.archive.org/web/{{ result.url }}">cached</a></p>
 	{% if result.publishedDate %}<p class="published_date">{{ result.publishedDate }}</p>{% endif %}
     <p class="content">{% if result.content %}{{ result.content|safe }}<br />{% endif %}</p>
-    <p class="url">{{ result.pretty_url }}</p>
   </div>
 </div>