Frontend can now filter with timespan

frontend/package.json

@@ -20,13 +20,13 @@
     "@angular/platform-browser": "~10.1.5",
     "@angular/platform-browser-dynamic": "~10.1.5",
     "@angular/router": "~10.1.5",
-    "@nebular/auth": "^6.2.1",
-    "@nebular/eva-icons": "^6.2.1",
-    "@nebular/theme": "^6.2.1",
+    "@types/chart.js": "^2.9.27",
     "@types/mapbox-gl": "^1.12.5",
+    "chart.js": "^2.9.4",
     "eva-icons": "^1.1.3",
     "geojson": "^0.5.0",
     "mapbox-gl": "^1.12.0",
+    "ng2-charts": "^2.4.2",
     "ngx-mapbox-gl": "^4.8.1",
     "rxjs": "~6.6.0",
     "tslib": "^2.0.0",