fix: remove unused default vars

_docs/index.md

@@ -19,8 +19,6 @@ Setup HashiCorp Vaul secrets manager.
   - [vault_config_volume](#vault_config_volume)
   - [vault_data_volume](#vault_data_volume)
   - [vault_default_lease_ttl](#vault_default_lease_ttl)
-  - [vault_default_password](#vault_default_password)
-  - [vault_default_user](#vault_default_user)
   - [vault_disable_clustering](#vault_disable_clustering)
   - [vault_exposed_ports](#vault_exposed_ports)
   - [vault_image](#vault_image)
@@ -100,22 +98,6 @@ vault_data_volume: vault-data
 vault_default_lease_ttl: 24h
 ```
 
-### vault_default_password
-
-#### Default value
-
-```YAML
-vault_default_password: vault
-```
-
-### vault_default_user
-
-#### Default value
-
-```YAML
-vault_default_user: admin
-```
-
 ### vault_disable_clustering
 
 #### Default value