refactor(ansible): centralize inventory and variables in 'vars' directory

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

ansible.cfg

@@ -6,7 +6,7 @@ interpreter_python=python3
 roles_path=./roles
 
 # (pathlist) Comma separated list of Ansible inventory sources
-inventory=./inventory
+inventory=./vars/
 
 # (path) The vault password file to use. Equivalent to --vault-password-file or --vault-id
 # If executable, it will be run and the resulting stdout will be used as the password.
@@ -36,3 +36,6 @@ skip=dark gray
 [tags]
 # (list) default list of tags to skip in your plays, has precedence over Run Tags
 ;skip=
+
+[inventory]
+ignore_extensions={{(REJECT_EXTS + ('.orig', '.cfg', '.retry', '.bak'))}}