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/open-webui/template.yml

@@ -1,14 +0,0 @@
-variables:
-  main_domain: ${domain}
-
-config:
-  domains:
-    - serviceName: open-webui
-      port: 8080
-      host: ${main_domain}
-
-  env:
-    OLLAMA_DOCKER_TAG: "0.1.47"
-    WEBUI_DOCKER_TAG: "0.3.7"
-
-  mounts: []