move version to its own endpoint

src/Umbraco.Web.UI.Client/temp-schema-generator/models.ts

@@ -1,8 +1,11 @@
 export interface InitResponse {
-    version: string;
     installed: boolean;
 }
 
+export interface VersionResponse {
+    version: string;
+}
+
 export interface UserResponse {
     username: string;
     role: string;