Add web front-end and fix API issues

node_modules/rxjs/dist/esm/internal/operators/mergeAll.js

@@ -0,0 +1,6 @@
+import { mergeMap } from './mergeMap';
+import { identity } from '../util/identity';
+export function mergeAll(concurrent = Infinity) {
+    return mergeMap(identity, concurrent);
+}
+//# sourceMappingURL=mergeAll.js.map