Add Roman Cuellar to the list of contributors (#50416)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Adds new employee as part of onboarding

## What is the current behavior?

N/A

## What is the new behavior?

N/A

## Additional context

N/A


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
  * Added Román Cuellar to the team member listing.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/docs/public/humans.txt

@@ -262,6 +262,7 @@ Richard Kasprzak
 Rob Shields
 Rodrigo Esteves
 Rodrigo Mansueli
+Román Cuellar
 Roman Hernandez
 Ronan Lehane
 Rory Wilding