Remove the last Gondulf references

The gondulf DNS record is deleted (checked against public DNS), so its
removed_records entry is no longer needed. vault_gondulf was also removed
from the vault.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dns.yml

@@ -86,8 +86,6 @@
             ip: "{{ network.netcup_ip }}"
           - name: "auth"  # Authentik, replaced by Pocket ID
             ip: "{{ network.netcup_ip }}"
-          - name: "gondulf"  # IndieAuth, replaced by StarPunk v2 + Pocket ID
-            ip: "{{ network.netcup_ip }}"
           - name: "files"
             ip: "{{ network.netcup_ip }}"
           - name: "kanboard"