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/unifi/template.yml

@@ -1,22 +0,0 @@
-variables: {}
-
-config:
-  domains: []
-
-  env: {}
-
-  mounts:
-    - filePath: init-mongo.sh
-      content: |
-        #!/bin/bash
-        mongo <<EOF
-        use unifi
-        db.createUser({
-        user: "unifi",
-        pwd: "unifi_password",
-        roles: [
-            { db: "unifi", role: "dbOwner" },
-            { db: "unifi_stat", role: "dbOwner" }
-        ]
-        })
-        EOF