Add barebone to support socket.io

(This is more a temp commit to update the frontend)

frontend/package.json

@@ -13,7 +13,7 @@
   "dependencies": {
     "@angular/animations": "~10.1.5",
     "@angular/cdk": "^10.2.1",
-    "@angular/common": "~10.1.5",
+    "@angular/common": ",
     "@angular/compiler": "~10.1.5",
     "@angular/core": "~10.1.5",
     "@angular/forms": "~10.1.5",
@@ -36,7 +36,6 @@
     "moment": "^2.29.1",
     "ng2-charts": "^2.4.2",
     "ngx-mapbox-gl": "^4.8.1",
-    "ngx-mqtt": "^7.0.14",
     "rxjs": "~6.6.0",
     "tslib": "^2.0.0",
     "zone.js": "~0.10.2"