docs: replace kindred.internal with example.internal in all docs and config

Replace all references to internal hostnames (silo.kindred.internal,
psql.kindred.internal, minio.kindred.internal, ipa.kindred.internal,
keycloak.kindred.internal) with example.internal equivalents.

Replace gitea.kindred.internal and git.kindred.internal with the public
git.kindred-systems.com instance. Also fix stale silo-0062 repo name
in setup-host.sh and DEPLOYMENT.md.

deployments/systemd/silod.env.example

@@ -2,11 +2,11 @@
 # Copy to /etc/silo/silod.env and fill in values
 # Permissions: chmod 600 /etc/silo/silod.env
 
-# Database credentials (psql.kindred.internal)
+# Database credentials (psql.example.internal)
 # Database: silo, User: silo
 SILO_DB_PASSWORD=
 
-# MinIO credentials (minio.kindred.internal)
+# MinIO credentials (minio.example.internal)
 # User: silouser
 SILO_MINIO_ACCESS_KEY=silouser
 SILO_MINIO_SECRET_KEY=
@@ -23,4 +23,4 @@ SILO_ADMIN_PASSWORD=
 # SILO_LDAP_BIND_PASSWORD=
 
 # Optional: Override server base URL
-# SILO_SERVER_BASE_URL=http://silo.kindred.internal:8080
+# SILO_SERVER_BASE_URL=http://silo.example.internal:8080