chore: remove separated version var from defaults

_docs/index.md

@@ -36,7 +36,6 @@ Setup HashiCorp Vaul secrets manager.
   - [vault_ui](#vault_ui)
   - [vault_unseal_keys](#vault_unseal_keys)
   - [vault_url](#vault_url)
-  - [vault_version](#vault_version)
   - [vault_volumes](#vault_volumes)
 - [Dependencies](#dependencies)
 
@@ -121,7 +120,7 @@ vault_exposed_ports: []
 #### Default value
 
 ```YAML
-vault_image: docker.io/hashicorp/vault:{{ vault_version }}
+vault_image: docker.io/hashicorp/vault:latest
 ```
 
 ### vault_log_level
@@ -253,22 +252,12 @@ vault_unseal_keys: []
 
 ### vault_url
 
-Specify address of the vault instance, used when building absolute urls, e.g. for websub.
-
 #### Default value
 
 ```YAML
 vault_url: http://localhost:8200
 ```
 
-### vault_version
-
-#### Default value
-
-```YAML
-vault_version: latest
-```
-
 ### vault_volumes
 
 > Define required docker volumes.