[enh] avoid /about redirect in template links

searx/templates/oscar/navbar.html

@@ -3,7 +3,7 @@
         <a href="{{ url_for('index') }}">{{ instance_name }}</a>{{- "" -}}
     </span>{{- "" -}}
     <span class="{% if rtl %}pull-left{% else %}pull-right{% endif %}">{{- "" -}}
-        <a href="{{ url_for('about') }}">{{ _('about') }}</a>{{- "" -}}
+        <a href="{{ url_for('help_page', pagename='about') }}">{{ _('about') }}</a>{{- "" -}}
         <a href="{{ url_for('preferences') }}">{{ _('preferences') }}</a>{{- "" -}}
     </span>{{- "" -}}
 </div>

searx/templates/simple/base.html

@@ -58,7 +58,7 @@
   </main>
   <footer>
     <p>
-    {{ _('Powered by') }} <a href="{{ url_for('about') }}">searxng</a> - {{ searx_version }} — {{ _('a privacy-respecting, hackable metasearch engine') }}<br/>
+    {{ _('Powered by') }} <a href="{{ url_for('help_page', pagename='about') }}">searxng</a> - {{ searx_version }} — {{ _('a privacy-respecting, hackable metasearch engine') }}<br/>
         <a href="{{ searx_git_url }}">{{ _('Source code') }}</a> |
         <a href="{{ get_setting('brand.issue_url') }}">{{ _('Issue tracker') }}</a> |
         <a href="{{ url_for('stats') }}">{{ _('Engine stats') }}</a> |