build: update build system and tooling

.babelrc

@@ -1,9 +1,24 @@
 {
   "presets": [
-    ["@babel/preset-env", { "modules": false, "useBuiltIns": false }]
+    ["@babel/preset-env", {
+      "modules": false,
+      "targets": {
+        "browsers": [
+          "> 1%",
+          "last 3 versions",
+          "ie >= 9",
+          "ios >= 8",
+          "android >= 4.2"
+        ]
+      },
+      "useBuiltIns": false
+      }]
   ],
   "plugins": [
-    ["styled-components", { "displayName": true }],
+    ["babel-plugin-styled-components", {
+      "displayName": true,
+      "pure": true
+      }],
     "@babel/plugin-proposal-class-properties",
     "react-hot-loader/babel"
   ]

.stylelintrc

@@ -7,6 +7,7 @@
   "rules": {
     "comment-empty-line-before": null,
     "declaration-colon-newline-after": null,
+    "property-no-vendor-prefix": true,
     "rule-empty-line-before": null
   }
 }

package.json

@@ -11,19 +11,20 @@
     "@aragon/api": "2.0.0-beta.8",
     "@aragon/os": "4.2.0",
     "@aragon/ui": "^1.2.1",
-    "@babel/polyfill": "^7.2.5",
     "@githubprimer/octicons-react": "^8.5.0",
     "axios": "^0.19.0",
     "bignumber.js": "^7.2.1",
     "codemirror": "^5.50.2",
+    "core-js": "^3.6.4",
     "dompurify": "^1.0.11",
     "drag-tracker": "^0.4.3",
     "ipfs-http-client": "^30.1.3",
     "prop-types": "^15.7.2",
     "react-dom": "^16.8.6",
     "react-markdown": "^4.2.2",
     "react": "^16.8.6",
-    "rxjs": "^6.4.0",
+    "regenerator-runtime": "^0.13.2",
+    "rxjs": "^6.5.2",
     "styled-components": "4.1.3",
     "web3-utils": "^1.0.0"
   },
@@ -34,17 +35,17 @@
     "@aragon/apps-voting": "2.1.0",
     "@aragon/templates-shared": "1.0.1",
     "@aragon/test-helpers": "^2.0.0",
-    "@babel/core": "^7.4.5",
-    "@babel/plugin-proposal-class-properties": "^7.4.4",
-    "@babel/preset-env": "^7.4.5",
-    "@babel/preset-react": "^7.0.0",
+    "@babel/core": "^7.5.4",
+    "@babel/plugin-proposal-class-properties": "^7.5.0",
+    "@babel/preset-env": "^7.5.4",
     "@commitlint/cli": "^8.2.0",
     "@commitlint/config-conventional": "^8.2.0",
     "@types/react": "^16.8.6",
     "acorn": "^6.1.1",
     "ava": "^1.4.1",
     "babel-eslint": "^10.0.1",
     "babel-plugin-styled-components": "^1.10.0",
+    "copyfiles": "^2.1.1",
     "coveralls": "3.0.2",
     "cross-env": "^5.2.0",
     "eslint": "^5.16.0",
@@ -63,7 +64,7 @@
     "homedir": "^0.6.0",
     "husky": "^3.0.0",
     "lint-staged": "^9.2.0",
-    "parcel-bundler": "1.12.3",
+    "parcel-bundler": "1.12.4",
     "prettier-eslint": "^9.0.0",
     "react-axe": "^3.0.1",
     "react-hot-loader": "^4.12.7",
@@ -87,14 +88,15 @@
     "clean:build": "npm run clean -- $npm_package_build_exclude_pattern",
     "clean": "git clean -fXd",
     "compile": "truffle compile",
-    "copy-public-assets": "rsync -rtu ./public/ ./dist",
+    "copy-public-assets": "copyfiles -u 1 './public/**/*' ./dist",
     "coverage": "cross-env SOLIDITY_COVERAGE=true npm run ganache-cli:test",
     "coveralls": "cat coverage/lcov.info | coveralls",
     "ganache-cli:test": "sh ./node_modules/@aragon/test-helpers/ganache-cli.sh",
     "lint:contracts": "solium --dir ./contracts",
+    "lint:css": "stylelint './**/*.js'",
     "lint:files": "eslint .",
-    "lint:fix": "npm run lint:contracts --fix && npm run lint:files --fix",
-    "lint": "npm run lint:contracts && npm run lint:files",
+    "lint:fix": "npm run lint:contracts -- --fix && npm run lint:files -- --fix && npm run lint:css",
+    "lint": "npm run lint:contracts && npm run lint:files && npm run lint:css",
     "precommit": "lint-staged",
     "prepublishOnly": "truffle compile && npm run abi:extract -- --no-compile",
     "publish:major": "npm run publish -- major --files dist",
@@ -121,10 +123,11 @@
   "license": "GPL-3.0",
   "author": "",
   "browserslist": [
-    ">2%",
-    "last 1 edge versions",
-    "not ie > 0",
-    "not op_mini all"
+    "> 1%",
+    "last 3 versions",
+    "ie >= 9",
+    "ios >= 8",
+    "android >= 4.2"
   ],
   "lint-staged": {
     "*.js": [