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/listmonk/template.yml

@@ -1,32 +0,0 @@
-variables:
-  main_domain: ${domain}
-
-config:
-  domains:
-    - serviceName: app
-      port: 9000
-      host: ${main_domain}
-
-  env:
-    # visit the page to setup your super admin user
-    # check config.toml in Advanced / Volumes for more options
-
-  mounts:
-    - filePath: config.toml
-      content: |
-        [app]
-        address = "0.0.0.0:9000"
-
-        [db]
-        host = "db"
-        port = 5432
-        user = "listmonk"
-        password = "listmonk"
-        database = "listmonk"
-
-        ssl_mode = "disable"
-        max_open = 25
-        max_idle = 25
-        max_lifetime = "300s"
-
-        params = ""