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

src-ui/src/app/components/dashboard/widgets/upload-file-widget/upload-file-widget.component.html

@@ -2,7 +2,7 @@
   <div content tourAnchor="tour.upload-widget">
     <form class="justify-content-center d-flex flex-column align-items-center">
       <button type="button" class="btn btn-outline-dark bg-light shadow-sm w-100 h-100 pt-3 pb-3" (click)="fileUpload.click()">
-        <i-bs class="text-primary me-1" name="plus-circle"></i-bs>
+        <pngx-bs-icon class="text-primary me-1" name="plus-circle"></pngx-bs-icon>
         <span class="text-primary" i18n>Upload documents</span>
         <div class="text-muted smaller fst-italic" i18n>or drop files anywhere</div>
       </button>