fix(ui): replace oqt URL in about page

Author: joker234

sketch_map_tool/templates/about.html

@@ -32,7 +32,7 @@ <h1>{{ _('The Tool') }}</h1>
             images.
             In addition, the tool can evaluate how well-suited an area of the OSM base map is for participatory mapping based on
             a quality analysis of the OSM base map data through the
-            <a href="https://oqt.ohsome.org/" target="_blank">HeiGIT ohsome quality analyst</a>.') }}
+            <a href="https://api.quality.ohsome.org/" target="_blank">HeiGIT ohsome quality API</a>.') }}
         </p>
         <p>
             {{ _('For the data collection through offline participatory mapping you only need your participants, the printed