Fix/fix block registration (#1059)

* fix disable button

* add backend env for restricting registration

* update state management

* add allow_signup to app info

* move allow_signup to backend only

* cleanup docker-compose

* potential darkmode fix

* fix missing variable

* add banner on login page

* use random bools for tests

* fix initial state bug

* fix state reset

frontend/composables/api/index.ts

@@ -1,2 +1,3 @@
+export { useAppInfo } from "./use-app-info";
 export { useStaticRoutes } from "./static-routes";
 export { useAdminApi, useUserApi } from "./api-client";