feat: rewrite auth (#364)

* feat: wip rewrite auth

* feat: restructure folders and fix stories and tests

* feat: remove auth provider and fix tests

front/src/modules/utils/assert.ts

@@ -0,0 +1,3 @@
+export function assertNotNull<T>(item: T): item is NonNullable<T> {
+  return item !== null && item !== undefined;
+}