version based on the git repository

This commit remove the need to update the brand for GIT_URL and GIT_BRANCH:
there are read from the git repository.

It is possible to call python -m searx.version freeze to freeze the current version.
Useful when the code is installed outside git (distro package, docker, etc...)

searx/templates/__common__/about.html

@@ -11,7 +11,7 @@
   <p>More about SearXNG ...</p>
 
   <ul>
-    <li><a href="{{ get_setting('brand.git_url') }}">SearXNG sources</a></li>
+    <li><a href="{{ searx_git_url }}">SearXNG sources</a></li>
     <li><a href="https://www.transifex.com/projects/p/searx/">transifex</a></li>
   </ul>
 
@@ -30,7 +30,7 @@
     </li>
     <li>
       SearXNG is free software, the code is 100% open and you can help to make
-      it better.  See more on <a href="{{ get_setting('brand.git_url')
+      it better.  See more on <a href="{{ searx_git_url
       }}">SearXNG sources</a>.
     </li>
   </ul>
@@ -81,7 +81,7 @@
 
   <p>
     SearXNG appreciates your concern regarding logs, so take the code from
-    the <a href="{{ get_setting('brand.git_url') }}">SearXNG project</a> and
+    the <a href="{{ searx_git_url }}">SearXNG project</a> and
     run it yourself!
   </p>
   <p>
@@ -95,7 +95,7 @@
 
   <p>
     See the <a href="{{ get_setting('brand.docs_url') }}">SearXNG docs</a>
-    and <a href="{{ get_setting('brand.git_url') }}">SearXNG sources</a>
+    and <a href="{{ searx_git_url }}">SearXNG sources</a>
   </p>
 
 </div>

searx/templates/oscar/base.html

@@ -83,7 +83,7 @@
             <p class="text-muted">
                 <small>
                     {{ _('Powered by') }} <a href="{{ get_setting('brand.docs_url') }}">SearXNG</a> - {{ searx_version }} - {{ _('a privacy-respecting, hackable metasearch engine') }}<br/>
-                    <a href="{{ get_setting('brand.git_url') }}">{{ _('Source code') }}</a> |
+                    <a href="{{ searx_git_url }}">{{ _('Source code') }}</a> |
                     <a href="{{ get_setting('brand.issue_url') }}">{{ _('Issue tracker') }}</a> |
                     <a href="{{ get_setting('brand.public_instances') }}">{{ _('Public instances') }}</a>{% if get_setting('general.contact_url') %} |
                     <a href="{{ get_setting('general.contact_url') }}">{{ _('Contact instance maintainer') }}</a>{% endif %}

searx/templates/simple/base.html

@@ -51,7 +51,7 @@
   <footer>
     <p>
     {{ _('Powered by') }} <a href="{{ url_for('about') }}">searxng</a> - {{ searx_version }} — {{ _('a privacy-respecting, hackable metasearch engine') }}<br/>
-        <a href="{{ get_setting('brand.git_url') }}">{{ _('Source code') }}</a> |
+        <a href="{{ searx_git_url }}">{{ _('Source code') }}</a> |
         <a href="{{ get_setting('brand.issue_url') }}">{{ _('Issue tracker') }}</a> |
         <a href="{{ get_setting('brand.public_instances') }}">{{ _('Public instances') }}</a>{% if get_setting('general.contact_url') %} |
         <a href="{{ get_setting('general.contact_url') }}">{{ _('Contact instance maintainer') }}</a>{% endif %}