docu(schema): update docs and examples to compact dict keys

inventory_example.yml

@@ -44,7 +44,7 @@ all:
             user:
               name: "ops"
               password: "CHANGE_ME"
-              public_key: "ssh-ed25519 AAAA..."
+              key: "ssh-ed25519 AAAA..."
             root:
               password: "CHANGE_ME"
             packages:
@@ -77,7 +77,7 @@ all:
           system:
             type: "virtual"
             os: "rhel"
-            os_version: "9"
+            version: "9"
             name: "db01.example.com"
             id: 101
             cpus: 4
@@ -97,14 +97,14 @@ all:
             user:
               name: "dbadmin"
               password: "CHANGE_ME"
-              public_key: "ssh-ed25519 AAAA..."
+              key: "ssh-ed25519 AAAA..."
             root:
               password: "CHANGE_ME"
             luks:
               enabled: true
               passphrase: "CHANGE_ME"
-              auto_decrypt_method: "keyfile"
-              keyfile_size: 128
+              method: "keyfile"
+              keysize: 128
             features:
               cis:
                 enabled: true