Add web front-end and fix API issues

node_modules/rxjs/dist/cjs/internal/observable/fromSubscribable.js

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.fromSubscribable = void 0;
+var Observable_1 = require("../Observable");
+function fromSubscribable(subscribable) {
+    return new Observable_1.Observable(function (subscriber) { return subscribable.subscribe(subscriber); });
+}
+exports.fromSubscribable = fromSubscribable;
+//# sourceMappingURL=fromSubscribable.js.map