refactor: remove deprecated YAML template files

- Deleted all 'template.yml' files from various blueprints as part of the transition to TOML format.
- Updated the script to delete the 'template.yml' files instead of converting them to 'template.toml'.

blueprints/phpmyadmin/template.yml

@@ -1,18 +0,0 @@
-variables:
-  main_domain: ${domain}
-  root_password: ${password:32}
-  user_password: ${password:32}
-
-config:
-  domains:
-    - serviceName: phpmyadmin
-      port: 80
-      host: ${main_domain}
-
-  env:
-    MYSQL_ROOT_PASSWORD: ${root_password}
-    MYSQL_DATABASE: "mysql"
-    MYSQL_USER: "phpmyadmin"
-    MYSQL_PASSWORD: ${user_password}
-
-  mounts: []