remove unused method

Oqtane.Client/Services/InstallationService.cs

@@ -56,10 +56,5 @@ namespace Oqtane.Services
         {
             await PostAsync($"{ApiUrl}/restart");
         }
-
-        public async Task RegisterAsync(string email, string name)
-        {
-            await PostJsonAsync($"{ApiUrl}/register?email={WebUtility.UrlEncode(email)}&name={WebUtility.UrlEncode(name)}", true);
-        }
     }
 }

Oqtane.Client/Services/Interfaces/IInstallationService.cs

@@ -34,14 +34,5 @@ namespace Oqtane.Services
         /// </summary>
         /// <returns>internal status/message object</returns>
         Task RestartAsync();
-
-        /// <summary>
-        /// Registers a new <see cref="User"/>
-        /// </summary>
-        /// <param name="email">Email of the user to be registered</param>
-        /// <param name="name">Name of the user to be registered</param>
-        /// <returns></returns>
-        Task RegisterAsync(string email, string name);
-
     }
 }