feat: custom branding (#112)

* add first concept

* remove setup status

* split config page in multiple components

* add custom branding docs

* add test email button

* fix invalid email from header

* add migration

* mount images to host

* update docs

* remove unused endpoint

* run formatter

backend/src/user/user.module.ts

@@ -4,7 +4,7 @@ import { UserController } from "./user.controller";
 import { UserSevice } from "./user.service";
 
 @Module({
-  imports:[EmailModule],
+  imports: [EmailModule],
   providers: [UserSevice],
   controllers: [UserController],
 })