chore: package.json cleanup

- cleanup `package.json` scripts
- remove `babel-jest` dependency
- remove `node-sass-chokidar` dependency
- remove `npm-run-all` dependency

Author: xidedix

package.json

@@ -38,18 +38,11 @@
     "simple-line-icons": "^2.4.1"
   },
   "devDependencies": {
-    "babel-jest": "^23.6.0",
-    "node-sass-chokidar": "^1.3.3",
-    "npm-run-all": "^4.1.3",
     "react-scripts": "^2.0.4"
   },
   "scripts": {
-    "build-css": "node-sass-chokidar --include-path ./node_modules ./src/scss -o ./src/scss",
-    "watch-css": "npm run build-css && node-sass-chokidar --include-path ./node_modules ./src/scss -o ./src/scss --watch --recursive",
-    "start-js": "react-scripts start",
-    "start": "npm-run-all -p watch-css start-js",
-    "build-js": "react-scripts build",
-    "build": "npm-run-all build-css build-js",
+    "start": "react-scripts start",
+    "build": "react-scripts build",
     "test": "react-scripts test",
     "test:debug": "react-scripts --inspect-brk test --runInBand",
     "eject": "react-scripts eject"