Add Gitea clone option to README

- Include both GitHub and Gitea clone commands
- Provide redundancy for repository access
- Label Gitea as alternative mirror

🤖 Generated with Claude Code (https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -9,7 +9,11 @@ From zero to fully configured macOS in minutes. This dotfiles repository provide
 **One command to rule them all:**
 
 ```bash
+# From GitHub
 git clone https://github.com/davidglidden/dotfiles.git ~/dotfiles && ~/dotfiles/engage
+
+# From Gitea (alternative mirror)
+git clone git@git.davidglidden.eu:davidglidden/dotfiles.git ~/dotfiles && ~/dotfiles/engage
 ```
 
 That's it! The `engage` script will guide you through a complete system setup.