refactor: use ngx-logger instead of @openstapps/logger

Closes #71

package.json

@@ -52,7 +52,6 @@
     "@openstapps/api": "0.22.0",
     "@openstapps/configuration": "0.25.0",
     "@openstapps/core": "0.36.0",
-    "@openstapps/logger": "0.4.0",
     "cordova-android": "8.0.0",
     "cordova-browser": "6.0.0",
     "cordova-ios": "5.0.0",
@@ -66,6 +65,7 @@
     "deepmerge": "3.3.0",
     "form-data": "2.5.0",
     "moment": "2.24.0",
+    "ngx-logger": "4.1.9",
     "ngx-markdown": "9.1.1",
     "ngx-moment": "3.4.0",
     "rxjs": "6.6.3",