fix: Update GitHub username in README

This commit updates all references to the previous GitHub username (Augusto047) and replaces them with the new, correct username (augusto-mate).
The change ensures that profile links, repository references, and any related documentation now point to the valid and current GitHub account.

Author: augusto-mate

README.md

@@ -33,7 +33,7 @@ This is a simple HTML5 webpage created as part of the **"Week 1"** assignment.
 
 ## 👨‍💻 Author
 
-Augusto Mate (GitHub: [@augusto047](https://github.com/augusto047))
+Augusto Mate (GitHub: [@augusto-mate](https://github.com/augusto-mate))
 
 ---