Update domain-structure.md

Author: wdhdev

src/domain-structure.md

@@ -1,4 +1,8 @@
-# Domains JSON file
+---
+tags: useful
+icon: file-code
+---
+# Domain Structure
 To register a subdomain, you need to create a new JSON file in the `domains` directory through a pull request. For example, to register `example.is-a.dev`, you would create a file named `example.json` in the `domains` directory. The full path would be `domains/example.json`.
 
 ## Filename