doc: update ssh config file vps (#1385)

moved away from togetherjava.duckdns.org to
togetherjava.org

Author: ankitsmt211

wiki/Access-the-VPS.md

@@ -18,7 +18,7 @@ ssh-keygen -t ed25519 -C "your_email@address.here" -f ~/.ssh/together-java-vps
 4. Add the following entry to your `.ssh/config` file:
 ```
 Host togetherjava
-HostName togetherjava.duckdns.org
+HostName togetherjava.org
 IdentityFile ~/.ssh/together-java-vps
 User root
 Port 22