[icons] Remove es folder (#14518)

* Add typescript definition related bits

* Avoid creating an es/ directory

* remove the @material-ui/icons/es folder to make yarn install faster

* [icons] Add remove es folder

* seb review

packages/material-ui-icons/package.json

@@ -25,7 +25,7 @@
     "build": "yarn build:cjs && yarn build:esm && yarn build:es && yarn build:typings && yarn build:copy-files",
     "build:cjs": "cross-env NODE_ENV=production BABEL_ENV=cjs babel --config-file ../../babel.config.js ./src --out-dir ./build --ignore \"**/*.test.js\"",
     "build:esm": "cross-env NODE_ENV=production BABEL_ENV=esm babel --config-file ../../babel.config.js ./src --out-dir ./build/esm --ignore \"**/*.test.js\"",
-    "build:es": "cross-env NODE_ENV=production BABEL_ENV=es babel --config-file ../../babel.config.js ./src --out-dir ./build/es --ignore \"**/*.test.js\"",
+    "build:es": "echo 'skip es folder'",
     "build:copy-files": "node ../../scripts/copy-files.js",
     "build:typings": "babel-node --config-file ../../babel.config.js ./scripts/create-typings.js",
     "prebuild": "rimraf material-design-icons && rimraf build",