refactor: update less to v3 to avoid all the deprecation warnings (#7)

Co-authored-by: Sai <sai@pelago.com.sg>

packages/react-scripts/config/webpack.config.js

@@ -571,6 +571,10 @@ module.exports = function(webpackEnv) {
                   // variable overrides for antd default less variables
                   // https://github.com/ant-design/ant-design/blob/master/components/style/themes/default.less
                   modifyVars: themeVariables,
+                  // Potential risk allowing inline js -> https://stackoverflow.com/a/50686643/13430933
+                  // However, this is required to support antd on less@^3.x.x unless we write our own plugins
+                  // to expose the same
+                  javascriptEnabled: true,
                 }
               ),
               // Don't consider CSS imports dead code even if the

packages/react-scripts/package.json

@@ -60,7 +60,7 @@
     "jest-environment-jsdom-fourteen": "1.0.1",
     "jest-resolve": "24.9.0",
     "jest-watch-typeahead": "0.4.2",
-    "less": "2.7.3",
+    "less": "^3.11.1",
     "less-loader": "^5.0.0",
     "less-vars-to-js": "^1.3.0",
     "mini-css-extract-plugin": "0.9.0",