fix(build): update tooling configuration and align nginx certificate generation with current dependencies

ts/smartnginx.classes.nginxhost.ts

@@ -22,7 +22,7 @@ export class NginxHost implements IHostConfig {
   public hostName: string; // the host name e.g. domain name
   public destination: string;
   public destinationPort: number;
-  public configString: string; // the actual host config file as string
+  public configString = ''; // the actual host config file as string
   public privateKey: string;
   public publicKey: string;