chore: add sponsor link and update avatar

Author: shuvroroy

content/authors/avatars/shuvroroy.jpg

@@ -3,6 +3,7 @@ name: Shuvro Roy
 slug: shuvroroy
 github_url: https://github.com/shuvroroy
 twitter_url: https://twitter.com/shuvro_008
+sponsors_url: https://buymeacoffee.com/shuvroroy
 ---
 
 Shuvro is a senior software engineer from Dhaka, BD. He contributes to Filament and lots of other open source projects. He works for [MailerLite](https://mailerlite.com/), a digital email marketing platform.