Fix missing icons and colorpicker when mounted on suburl (#15501)

* Fix missing icons and colorpicker when mounted on suburl

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per silverwind

Signed-off-by: Andrew Thornton <art27@cantab.net>

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

webpack.config.js

@@ -188,7 +188,7 @@ export default {
         type: 'asset/resource',
         generator: {
           filename: 'fonts/[name][ext]',
-          publicPath: '/', // required to remove css/ path segment
+          publicPath: '../', // required to remove css/ path segment
         }
       },
       {
@@ -196,7 +196,7 @@ export default {
         type: 'asset/resource',
         generator: {
           filename: 'img/webpack/[name][ext]',
-          publicPath: '/', // required to remove css/ path segment
+          publicPath: '../', // required to remove css/ path segment
         }
       },
     ],