mjolnir: remove mjolnir as it got moved to ansible-infra

See:
fe647da3bf

.sops.yaml

@@ -15,7 +15,6 @@ keys:
   - &host_age_matrix age1f7ams0n2zy994pzt0u30h8tex6xdcernj59t4d70z4kjsyzrr3wsy87xzk
   - &host_age_public_web_static age19s7r8sf7j6zk24x9vumawgxpd2q8epyv7p9qsjntw7v9s3v045mqhmsfp0
   - &host_age_yate age1kxzl00cfa5v926cvtcp0l3fncwh6fgmk8jvpf4swkl4vh3hv9e5qyqsrnt
-  - &host_age_mjolnir age1ej52kwuj8xraxdq685eejj4dmxpfmpgt4d8jka98rtpal6xcueqq9a6wae
   - &host_age_woodpecker age1klxtcr23hers0lh4f5zdd53tyrtg0jud35rhydstyjq9fjymf9hsn2a8ch
   - &host_age_penpot age10ku5rphtsf2lcxg78za7f2dad5cx5x9urgkce0d7tyqwq2enva9sqf7g8r
 creation_rules:
@@ -79,21 +78,6 @@ creation_rules:
           - *admin_gpg_c6ristian
         age:
           - *host_age_public_web_static
-  - path_regex: config/hosts/mjolnir/.*
-    key_groups:
-      - pgp:
-          - *admin_gpg_djerun
-          - *admin_gpg_stb
-          - *admin_gpg_jtbx
-          - *admin_gpg_yuri
-          - *admin_gpg_june
-          - *admin_gpg_haegar
-          - *admin_gpg_dario
-          - *admin_gpg_echtnurich
-          - *admin_gpg_max
-          - *admin_gpg_c6ristian
-        age:
-          - *host_age_mjolnir
   - path_regex: config/hosts/woodpecker/.*
     key_groups:
       - pgp: