downgrade mini-css-extract-plugin since it makes build fails cause of sourcemap bullshit

Signed-off-by: MiniDigger <admin@minidigger.me>

src/main/frontend/package.json

@@ -45,7 +45,7 @@
     "eslint-plugin-prettier": "3.1.4",
     "eslint-plugin-vue": "7.0.1",
     "lint-staged": "10.5.2",
-    "mini-css-extract-plugin": "1.3.2",
+    "mini-css-extract-plugin": "1.2.1",
     "prettier": "2.2.0",
     "sass": "1.30.0",
     "sass-loader": "10.0.5",

src/main/frontend/src/components/Editor.vue

@@ -296,9 +296,7 @@ button.open:hover {
 .button-hide-leave-to {
     transform: translateX(34px);
 }
-</style>
-<style lang="scss">
-@import '../scss/utils';
+
 .page-rendered {
     @include basic-border();
     @include box-shadow4(0, 1px, 1px, rgba(0, 0, 0, 0.05));

src/main/frontend/yarn.lock

@@ -6353,10 +6353,10 @@ mimic-fn@^2.1.0:
   resolved "https://registry.yarnpkg.com/mimic-fn/-/mimic-fn-2.1.0.tgz#7ed2c2ccccaf84d3ffcb7a69b57711fc2083401b"
   integrity sha512-OqbOk5oEQeAZ8WXWydlu9HJjz9WVdEIvamMCcXmuqUYjTknH/sqsWvhQ3vgwKFRR1HpjvNBKQ37nbJgYzGqGcg==
 
-mini-css-extract-plugin@1.3.2:
-  version "1.3.2"
-  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.3.2.tgz#e2c9c0ef3f7c1a516916a3ab7b073a761e5b1d26"
-  integrity sha512-ofYJgCZNm1TToSv02pGANe1lfb31g7ULwNV5Nt31d2dAnVLxFHoguDUAj6U0BLEO7Nrztq4mdtL1yFDaeW7J+A==
+mini-css-extract-plugin@1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/mini-css-extract-plugin/-/mini-css-extract-plugin-1.2.1.tgz#30ea7dee632b3002b0c77aeed447790408cb247e"
+  integrity sha512-G3yw7/TQaPfkuiR73MDcyiqhyP8SnbmLhUbpC76H+wtQxA6wfKhMCQOCb6wnPK0dQbjORAeOILQqEesg4/wF7A==
   dependencies:
     loader-utils "^2.0.0"
     schema-utils "^3.0.0"