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/doublezero/template.yml

@@ -1,21 +0,0 @@
-variables:
-  main_domain: ${domain}
-  secret_key_base: ${base64:64}
-
-config:
-  domains:
-    - serviceName: doublezero
-      port: 4000
-      host: ${main_domain}
-
-  env:
-    - DOUBLEZERO_HOST=${main_domain}
-    - DOUBLEZERO_PORT=4000
-    - SECRET_KEY_BASE=${secret_key_base}
-    - AWS_ACCESS_KEY_ID=your-aws-access-key
-    - AWS_SECRET_ACCESS_KEY=your-aws-secret-key
-    - AWS_REGION=your-aws-region
-    - SQS_URL=your-aws-sqs-url
-    - SYSTEM_EMAIL=
-
-  mounts: []