Add server name config option for use in client redirects

src/util/config/types/GeneralConfiguration.ts

@@ -20,6 +20,7 @@ import { Snowflake } from "@spacebar/util";
 
 export class GeneralConfiguration {
     instanceName: string = "Spacebar Instance";
+    serverName: string | null = null;
     instanceDescription: string | null = "This is a Spacebar instance made in the pre-release days";
     frontPage: string | null = null;
     tosPage: string | null = null;