Remove fomantic image module (#21145)

Remove this small, but unnecessary
[module](https://fomantic-ui.com/elements/image.html) and use `img`
selector over previous `.image`. Did a few tests, could not notice any
visual regression.

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>

web_src/less/_review.less

@@ -90,10 +90,10 @@
         float: none;
         margin: 0 .5rem 0 0;
         flex-shrink: 0;
+      }
 
-        &.image {
-          margin: 0 !important;
-        }
+      img.avatar {
+        margin: 0 !important;
       }
 
       .comment-content {