Chore: Check for deprecations using eslint plugin

Chore: environment file replacement stopped.
Chore: All components are now standalone and removed all modules
Chore: App routing is now in app.routes and similarly for all submodules
Chore: Http interceptors are now functional and split refresh interceptor into a separate one.

overlord/src/app/cost-centre/cost-centre-detail/cost-centre-detail.component.ts

@@ -1,5 +1,9 @@
 import { AfterViewInit, Component, ElementRef, OnInit, ViewChild } from '@angular/core';
-import { FormControl, FormGroup } from '@angular/forms';
+import { FormControl, FormGroup, ReactiveFormsModule } from '@angular/forms';
+import { MatButton } from '@angular/material/button';
+import { MatCard, MatCardHeader, MatCardTitle, MatCardContent, MatCardActions } from '@angular/material/card';
+import { MatFormField, MatLabel } from '@angular/material/form-field';
+import { MatInput } from '@angular/material/input';
 import { ActivatedRoute, Router } from '@angular/router';
 
 import { CostCentre } from '../../core/cost-centre';
@@ -10,6 +14,19 @@ import { CostCentreService } from '../cost-centre.service';
   selector: 'app-cost-centre-detail',
   templateUrl: './cost-centre-detail.component.html',
   styleUrls: ['./cost-centre-detail.component.css'],
+  standalone: true,
+  imports: [
+    MatCard,
+    MatCardHeader,
+    MatCardTitle,
+    MatCardContent,
+    ReactiveFormsModule,
+    MatFormField,
+    MatLabel,
+    MatInput,
+    MatCardActions,
+    MatButton,
+  ],
 })
 export class CostCentreDetailComponent implements OnInit, AfterViewInit {
   @ViewChild('nameElement', { static: true }) nameElement?: ElementRef;
@@ -54,15 +71,15 @@ export class CostCentreDetailComponent implements OnInit, AfterViewInit {
   }
 
   save() {
-    this.ser.saveOrUpdate(this.getItem()).subscribe(
-      () => {
+    this.ser.saveOrUpdate(this.getItem()).subscribe({
+      next: () => {
         this.toaster.show('Success', '');
         this.router.navigateByUrl('/cost-centres');
       },
-      (error) => {
+      error: (error) => {
         this.toaster.show('Danger', error);
       },
-    );
+    });
   }
 
   getItem(): CostCentre {