replace momentjs (incl. calendar)

package.json

@@ -10,12 +10,12 @@
     "test:ci": "jest"
   },
   "dependencies": {
+    "date-fns": "^2.16.1",
     "ics": "^2.24.0",
-    "moment": "^2.28.0",
     "mongoose": "^5.10.5",
     "next": "^9.5.3",
     "react": "16.13.1",
-    "react-calendar-component": "^3.0.0",
+    "react-calendar": "^3.1.0",
     "react-dom": "16.13.1",
     "uuid": "^8.3.0"
   },
@@ -24,6 +24,7 @@
     "@types/jest": "^26.0.14",
     "@types/mongoose": "^5.7.36",
     "@types/react": "^16.9.49",
+    "@types/react-calendar": "^3.1.1",
     "@types/uuid": "^8.3.0",
     "babel-jest": "^26.3.0",
     "jest": "^26.4.2",