feat: add bookmarking for units (#11)

* feat: add bookmarking for units

* refactor: add redux for state management

package.json

@@ -43,6 +43,7 @@
     "@fortawesome/free-regular-svg-icons": "^5.12.0",
     "@fortawesome/free-solid-svg-icons": "^5.12.0",
     "@fortawesome/react-fontawesome": "^0.1.8",
+    "@reduxjs/toolkit": "^1.2.3",
     "classnames": "^2.2.6",
     "core-js": "^3.6.2",
     "prop-types": "^15.7.2",
@@ -51,7 +52,7 @@
     "react-redux": "^7.1.3",
     "react-router": "^5.1.2",
     "react-router-dom": "^5.1.2",
-    "redux": "^4.0.4",
+    "redux": "^4.0.5",
     "regenerator-runtime": "^0.13.3"
   },
   "devDependencies": {