Move jquery-minicolors to npm/webpack (#12305)

* Move jquery-minicolors to npm/webpack

- Unvendor and add as npm dependency
- Removed unneeded backend variable
- Fixed existing bug where picker would previously initizalize to the
  same green color when editing a label.

There was probably a version bump because the previous version was
over 3 years old but it seems to be compatible.

* use file-loader

* trailing comma and comment update

* misc tweaks

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

webpack.config.js

@@ -243,7 +243,20 @@ module.exports = {
             options: {
               name: '[name].[ext]',
               outputPath: 'fonts/',
-              publicPath: (url) => `../fonts/${url}`, // seems required for monaco's font
+              publicPath: (url) => `../fonts/${url}`, // required to remove css/ path segment
+            },
+          },
+        ],
+      },
+      {
+        test: /\.png$/i,
+        use: [
+          {
+            loader: 'file-loader',
+            options: {
+              name: '[name].[ext]',
+              outputPath: 'img/webpack/',
+              publicPath: (url) => `../img/webpack/${url}`, // required to remove css/ path segment
             },
           },
         ],