chore: add GitHub Sponsors badge and support section to README

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AnjanJ

README.md

@@ -1,6 +1,7 @@
 # 🚀 AJ's Dotfiles
 
 [![Buy Me A Coffee](https://img.shields.io/badge/Buy%20Me%20A%20Coffee-support-yellow?logo=buymeacoffee)](https://buymeacoffee.com/anjanj)
+[![Sponsor](https://img.shields.io/badge/Sponsor-GitHub%20Sponsors-ea4aaa?logo=githubsponsors)](https://github.com/sponsors/AnjanJ)
 
 > A complete macOS development environment — Ruby/Rails, Elixir/Phoenix, Node/React, Python, Go, Rust, Zig — with your choice of Tokyo Night, Aura Dark, or Catppuccin Mocha theme applied everywhere.
 
@@ -697,9 +698,11 @@ Found a bug or have a suggestion? Open an issue or PR!
 
 **Made with ❤️ by [AJ](https://anjan.dev)**
 
-If this setup saves you time, consider buying me a coffee:
+## Support
 
-<a href="https://www.buymeacoffee.com/anjanj" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-yellow.png" alt="Buy Me A Coffee" width="200"></a>
+If this setup saves you time, consider sponsoring the project. It keeps development going and lets me know people are finding it useful.
+
+<a href="https://github.com/sponsors/AnjanJ" target="_blank"><img src="https://img.shields.io/badge/Sponsor_on_GitHub-ea4aaa?style=for-the-badge&logo=githubsponsors&logoColor=white" alt="Sponsor on GitHub"></a>&nbsp;&nbsp;<a href="https://www.buymeacoffee.com/anjanj" target="_blank"><img src="https://img.shields.io/badge/Buy_Me_A_Coffee-FFDD00?style=for-the-badge&logo=buymeacoffee&logoColor=black" alt="Buy Me A Coffee"></a>
 
 *Inspired by DHH's Omakub and ThePrimeagen's workflows*