Add Stephanie Jackson to humans.txt (#47937)

## 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?

Docs update

## What is the current behavior?

I am not listed

## What is the new behavior?

I am now listed!

## Additional context

Onboarding task of course.

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

## Summary by CodeRabbit

* **Documentation**
* Added Stephanie Jackson to the team credits in the project’s public
documentation.

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

apps/docs/public/humans.txt

@@ -268,6 +268,7 @@ Shane Adams
 Shane E
 Shreekar Shetty
 Sreyas Udayavarman
+Stephanie Jackson (stejacks)
 Stephen Morgan
 Steve Chavez
 Steven Eubank