[mod] typification of SearXNG: add new result type Image (#6142)

- Python class:   searx/result_types/image.py
- Jinja template: searx/templates/simple/result_templates/images.html
- CSS (less)      client/simple/src/less/result_types/image.less

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

client/simple/src/less/style.less

@@ -7,7 +7,6 @@
 @import "mixins.less";
 @import "toolkit.less";
 @import "autocomplete.less";
-@import "detail.less";
 @import "animations.less";
 @import "embedded.less";
 @import "info.less";
@@ -1165,3 +1164,4 @@ pre code {
 @import "result_types/code.less";
 @import "result_types/paper.less";
 @import "result_types/file.less";
+@import "result_types/image.less";