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/shlink/template.yml

@@ -1,18 +0,0 @@
-variables:
-  main_domain: ${domain}
-  initial_api_key: ${password:30}
-
-config:
-  domains:
-    - serviceName: shlink-web
-      port: 8080
-      host: web-${main_domain}
-    - serviceName: shlink
-      port: 8080
-      host: ${main_domain}
-
-  env:
-    INITIAL_API_KEY: ${initial_api_key}
-    DEFAULT_DOMAIN: ${main_domain}
-
-  mounts: []