change layout for better management

- instead of just `syspkgs` and `srcpkgs` add more lists
  - `appimages`, `flatpkgs` and others as they come up

vars/bitwarden.yml

@@ -1,9 +1,8 @@
 # vim: set filetype=yaml.ansible :
 ---
-install_prefix: "{{ default_config.install_prefix }}"
-install_dir: /opt/bitwarden
-use_flatpak: true
-use_appimage: false
+install_prefix: "{{ default_install_prefix }}"
+install_dir: /opt/appimage/bitwarden
+install_method: flatpak
 dobecome: true
 owner: root
 group: root