Lazy loading

###
Hello,

* [ ] bug report
* [ ] feature request
* question about the decisions made in the repository

### Issue description

**Current behavior:**

When i run my app in production, the lazy loading don't work and the app take more time to load

**Expected behavior:**

**Steps to reproduce:**

**Related code:**

```
insert short code snippets here
```

### Other information:

**npm, node, OS, Browser**
```

```

**Angular, Nebular**
```

```
{
"name": "ngx-admin",
"version": "5.0.0",
"license": "MIT",
"repository": {
"type": "git",
"url": "git+https://github.com/akveo/ngx-admin.git"
},
"bugs": {
"url": "https://github.com/akveo/ngx-admin/issues"
},
"scripts": {
"ng": "ng",
"conventional-changelog": "conventional-changelog",
"start": "ng serve",
"build": "ng build",
"build:prod": "npm run build -- --prod --aot",
"test": "ng test",
"test:coverage": "rimraf coverage && npm run test -- --code-coverage",
"lint": "ng lint",
"lint:fix": "ng lint ngx-admin-demo --fix",
"lint:styles": "stylelint ./src/**/*.scss",
"lint:ci": "npm run lint && npm run lint:styles",
"pree2e": "webdriver-manager update --standalone false --gecko false",
"e2e": "ng e2e",
"docs": "compodoc -p src/tsconfig.app.json -d docs",
"docs:serve": "compodoc -p src/tsconfig.app.json -d docs -s",
"prepush": "npm run lint:ci",
"release:changelog": "npm run conventional-changelog -- -p angular -i CHANGELOG.md -s",
"postinstall": "ngcc --properties es2015 es5 browser module main --first-only --create-ivy-entry-points"
},
"dependencies": {
"@akveo/ng2-completer": "^9.0.1",
"@angular/animations": "^11.0.3",
"@angular/cdk": "^9.1.2",
"@angular/common": "^9.0.4",
"@angular/compiler": "^9.0.4",
"@angular/core": "^9.0.4",
"@angular/forms": "^9.0.4",
"@angular/google-maps": "^9.1.0",
"@angular/localize": "^9.0.4",
"@angular/platform-browser": "^9.0.4",
"@angular/platform-browser-dynamic": "^9.0.4",
"@angular/router": "^9.0.4",
"@asymmetrik/ngx-leaflet": "3.0.1",
"@nebular/auth": "5.0.0",
"@nebular/eva-icons": "5.0.0",
"@nebular/security": "5.0.0",
"@nebular/theme": "5.0.0",
"@ng-bootstrap/ng-bootstrap": "^6.2.0",
"@swimlane/ngx-charts": "^13.0.2",
"angular2-chartjs": "0.4.1",
"angularx-qrcode": "^10.0.11",
"bootstrap": "4.3.1",
"chart.js": "2.7.1",
"ckeditor": "4.7.3",
"classlist.js": "1.1.20150312",
"core-js": "2.5.1",
"echarts": "^4.0.2",
"eva-icons": "^1.1.3",
"intl": "1.2.5",
"ionicons": "2.0.1",
"jwt-decode": "^3.1.2",
"leaflet": "1.2.0",
"nebular-icons": "1.1.0",
"ng-recaptcha": "^6.0.2",
"ng2-ckeditor": "^1.2.2",
"ng2-smart-table": "^1.6.0",
"ngx-cookie-service": "^10.1.1",
"ngx-echarts": "^4.2.2",
"ngx-spinner": "^10.0.1",
"ngx-toastr": "^13.2.0",
"ngx-webstorage": "^4.0.2",
"ngx-webstorage-service": "^4.1.0",
"node-sass": "^4.12.0",
"normalize.css": "6.0.0",
"pace-js": "1.0.2",
"pdfmake": "^0.1.68",
"roboto-fontface": "0.8.0",
"rxjs": "6.5.4",
"rxjs-compat": "6.3.0",
"socicon": "3.0.5",
"style-loader": "^1.1.3",
"tinymce": "4.5.7",
"tslib": "^1.10.0",
"typeface-exo": "0.0.22",
"web-animations-js": "^2.3.2",
"zone.js": "~0.10.2"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.900.4",
"@angular/cli": "^9.0.4",
"@angular/compiler-cli": "^9.0.4",
"@angular/language-service": "9.0.4",
"@compodoc/compodoc": "1.0.1",
"@fortawesome/fontawesome-free": "^5.2.0",
"@types/d3-color": "1.0.5",
"@types/googlemaps": "^3.39.3",
"@types/jasmine": "2.5.54",
"@types/jasminewd2": "2.0.3",
"@types/leaflet": "1.2.3",
"@types/node": "^12.11.1",
"codelyzer": "^5.1.2",
"conventional-changelog-cli": "1.3.4",
"husky": "0.13.3",
"jasmine-core": "2.6.4",
"jasmine-spec-reporter": "4.1.1",
"karma": "1.7.1",
"karma-chrome-launcher": "2.1.1",
"karma-cli": "1.0.1",
"karma-coverage-istanbul-reporter": "1.3.0",
"karma-jasmine": "1.1.0",
"karma-jasmine-html-reporter": "0.2.2",
"npm-run-all": "4.0.2",
"protractor": "5.1.2",
"rimraf": "2.6.1",
"stylelint": "7.13.0",
"ts-node": "3.2.2",
"tslint": "^5.7.0",
"tslint-language-service": "^0.9.9",
"typescript": "3.7.5"
}
}