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/invoiceshelf/template.yml

@@ -1,19 +0,0 @@
-variables:
-  main_domain: ${domain}
-  db_password: ${password}
-  db_username: "invoiceshelf"
-  db_database: "invoiceshelf"
-
-config:
-  domains:
-    - serviceName: invoiceshelf-app
-      port: 80
-      host: ${main_domain}
-
-  env:
-    INVOICESHELF_HOST: ${main_domain}
-    DB_PASSWORD: ${db_password}
-    DB_USERNAME: ${db_username}
-    DB_DATABASE: ${db_database}
-
-  mounts: []