# why

* The release of Function Secrets enables us to support Stagehand
deployments on Browserbase. This PR showcases that in the new deployment
guide

# what changed

# test plan

<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Updates the Stagehand deployment guide to recommend Browserbase
Functions with encrypted project secrets as the primary deployment path
instead of Vercel.

- Adds setup, extension upload, Function development, local testing,
publishing, secret attachment, invocation, and troubleshooting steps.
- Uses the Model Gateway in the example, so no model provider setup is
needed.
- Moves the Vercel guide under "Other deployment options" and adds a
Features section.
- Clarifies the introduction's description of Stagehand's control
layers.

<sup>Written for commit 83c9e203059f5d2c4093fb46af7415c0f64a2289.
Summary will update on new commits.</sup>

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