[simple] link preferences on /about and /stats

We want to link the preferences from every page
(except of course the preferences page).

searx/templates/simple/base.html

@@ -47,6 +47,10 @@
         </div>
     {% endif %}
 
+    {% block linkto_preferences %}
+    {% from 'simple/icons.html' import icon_big %}
+      <nav id="linkto_preferences"><a href="{{ url_for('preferences') }}">{{ icon_big('menu-outline') }}</a></nav>
+    {% endblock %}
     {% block header %}
     {% endblock %}
     {% block content %}

searx/templates/simple/index.html

@@ -4,7 +4,6 @@
 	<link rel="preload" href="{{ url_for('static', filename='img/searxng.png') }}" as="image" />
 {% endblock %}
 {% block content %}
-<nav id="linkto_preferences"><a href="{{ url_for('preferences') }}">{{ icon_big('menu-outline') }}</a></nav>
 <div class="index">
     <div class="title"><h1>SearXNG</h1></div>
     {% include 'simple/simple_search.html' %}

searx/templates/simple/preferences.html

@@ -94,6 +94,7 @@
 {%- endmacro -%}
 
 {% block head %} {% endblock %}
+{% block linkto_preferences %}{% endblock %}
 {% block content %}
 <h1>{{ _('Preferences') }}</h1>
 

searx/templates/simple/results.html

@@ -10,7 +10,6 @@
 {% block title %}{% if query_in_title %}{{- q|e }} - {% endif %}{% endblock %}
 {% block meta %}<link rel="alternate" type="application/rss+xml" title="Searx search: {{ q|e }}" href="{{ url_for('search', _external=True) }}?q={{ q|urlencode }}&amp;categories={{ selected_categories|join(",") | replace(' ','+') }}&amp;pageno={{ pageno }}&amp;time_range={{ time_range }}&amp;language={{ current_language }}&amp;safesearch={{ safesearch }}&amp;format=rss">{% endblock %}
 {% block content %}
-<nav id="linkto_preferences"><a href="{{ url_for('preferences') }}">{{ icon_big('menu-outline') }}</a></nav>
 {% include 'simple/search.html' %}
 
 {% if results and results|map(attribute='template')|unique|list|count == 1 %}