fix(tailwind): Ensure tailwind properly purges unused utility classes (#2485)

package.json

@@ -91,7 +91,6 @@
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "7.x",
     "eslint-plugin-react-hooks": "4.2.0",
-    "extract-css-chunks-webpack-plugin": "^4.9.0",
     "html-webpack-plugin": "^5.3.2",
     "husky": "^3.0.0",
     "jest": "^24.8.0",
@@ -99,11 +98,12 @@
     "jest-junit": "^6.4.0",
     "lerna": "^3.15.0",
     "lint-staged": "^9.0.2",
+    "mini-css-extract-plugin": "^2.1.0",
     "optimize-css-assets-webpack-plugin": "^5.0.3",
-    "postcss": "^8.2.15",
-    "postcss-import": "^12.0.1",
-    "postcss-loader": "^4.0.3",
-    "postcss-preset-env": "^6.6.0",
+    "postcss": "^8.3.5",
+    "postcss-import": "^14.0.2",
+    "postcss-loader": "^6.1.1",
+    "postcss-preset-env": "^6.7.0",
     "prettier": "^1.18.2",
     "react-hot-loader": "^4.13.0",
     "serve": "^11.1.0",