[mod] darker green url in logicodev

searx/static/themes/oscar/less/logicodev/variables.less

 @blue: #0088CC; 
 @red: #F35E77;
 @violet: #684898;
-@dark-green: #26a65b;
+@dark-green: #069025;
 @green: #2ecc71;
 @light-green: #01D7D4; 
 @orange: #FFA92F;