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/convex/template.yml

@@ -1,23 +0,0 @@
-variables:
-  dashboard_domain: ${domain}
-  backend_domain: ${domain}
-  actions_domain: ${domain}
-
-config:
-  domains:
-    - serviceName: dashboard
-      port: 6791
-      host: ${dashboard_domain}
-    - serviceName: backend
-      port: 3210
-      host: ${backend_domain}
-    - serviceName: backend
-      port: 3211
-      host: ${actions_domain}
-
-  env:
-    - NEXT_PUBLIC_DEPLOYMENT_URL=http://${backend_domain}
-    - CONVEX_CLOUD_ORIGIN=http://${backend_domain}
-    - CONVEX_SITE_ORIGIN=http://${actions_domain}
-
-  mounts: []