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

src-ui/angular.json

@@ -69,6 +69,9 @@
               "src/polyfills.ts"
             ],
             "tsConfig": "tsconfig.app.json",
+            "loader": {
+              ".svg": "text"
+            },
             "localize": true,
             "assets": [
               "src/apple-touch-icon.png",