Uniformize folder structure (#693)

* Uniformize folder structure

* Fix icons

* Fix icons

* Fix tests

* Fix tests

front/src/utils/promise-to-observable.ts

@@ -0,0 +1,16 @@
+import { Observable } from '@apollo/client';
+
+export const promiseToObservable = <T>(promise: Promise<T>) =>
+  new Observable<T>((subscriber) => {
+    promise.then(
+      (value) => {
+        if (subscriber.closed) {
+          return;
+        }
+
+        subscriber.next(value);
+        subscriber.complete();
+      },
+      (err) => subscriber.error(err),
+    );
+  });