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/fomantic/semantic.json

@@ -35,7 +35,6 @@
     "grid",
     "header",
     "icon",
-    "image",
     "input",
     "item",
     "label",