Remove VITE_SERVER_ENDPOINT dependency (#428)

* Move backend api to its own instance

* Remove external fetch hook

* Added endpoint for album

* Added endpoint for admin page

* Make request directly to immich-server

* Refactor unsued code

server/apps/immich/src/config/app.config.ts

@@ -16,6 +16,5 @@ export const immichAppConfig: ConfigModuleOptions = {
       then: Joi.string().optional().allow(null, ''),
       otherwise: Joi.string().required(),
     }),
-    VITE_SERVER_ENDPOINT: Joi.string().required(),
   }),
 };