Add support for deleting a subuser from a server

resources/scripts/api/server/users/deleteSubuser.ts

@@ -0,0 +1,9 @@
+import http from '@/api/http';
+
+export default (uuid: string, userId: string): Promise<void> => {
+    return new Promise((resolve, reject) => {
+        http.delete(`/api/client/servers/${uuid}/users/${userId}`)
+            .then(() => resolve())
+            .catch(reject);
+    });
+};