Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/util/arrRemove.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.arrRemove = void 0;
+function arrRemove(arr, item) {
+    if (arr) {
+        var index = arr.indexOf(item);
+        0 <= index && arr.splice(index, 1);
+    }
+}
+exports.arrRemove = arrRemove;
+//# sourceMappingURL=arrRemove.js.map