Chore: ditch the abandoned ngx-bootstrap-icons, roll our own (#14665)

src-ui/src/app/components/not-found/not-found.component.ts

@@ -1,13 +1,13 @@
 import { Component } from '@angular/core'
 import { RouterModule } from '@angular/router'
-import { NgxBootstrapIconsModule } from 'ngx-bootstrap-icons'
+import { BootstrapIconComponent } from 'src/app/components/common/bootstrap-icon/bootstrap-icon.component'
 import { LogoComponent } from '../common/logo/logo.component'
 
 @Component({
   selector: 'pngx-not-found',
   templateUrl: './not-found.component.html',
   styleUrls: ['./not-found.component.scss'],
-  imports: [LogoComponent, NgxBootstrapIconsModule, RouterModule],
+  imports: [LogoComponent, BootstrapIconComponent, RouterModule],
 })
 export class NotFoundComponent {
   constructor() {}