fix environments demo (#696)

* fix

* fixes

* fixes

* update docs

* fixes

* fixes

* sandbox tokens

* better logging

README.md

@@ -715,9 +715,7 @@ AGENT_BROWSER_EXECUTABLE_PATH=/path/to/chromium agent-browser open example.com
 
 ### Serverless (Vercel)
 
-Two patterns for using agent-browser from Next.js server actions on Vercel:
-
-**Vercel Sandbox** -- run agent-browser + Chrome in an ephemeral microVM. No external server needed:
+Run agent-browser + Chrome in an ephemeral Vercel Sandbox microVM. No external server needed:
 
 ```typescript
 import { Sandbox } from "@vercel/sandbox";
@@ -728,23 +726,7 @@ const result = await sandbox.runCommand("agent-browser", ["screenshot", "--json"
 await sandbox.stop();
 ```
 
-**External API server** -- host agent-browser on a server, call it from Vercel via HTTP:
-
-```typescript
-const res = await fetch(`${process.env.AGENT_BROWSER_API_URL}/api/run`, {
-  method: "POST",
-  headers: { "Content-Type": "application/json" },
-  body: JSON.stringify({
-    commands: [
-      { action: "launch", headless: true },
-      { action: "navigate", url: "https://example.com" },
-      { action: "screenshot" },
-    ],
-  }),
-});
-```
-
-See the [demo app](examples/demo/) for a visual demo of agent-browser's core capabilities across different compute environments.
+See the [environments example](examples/environments/) for a working demo with a UI and deploy-to-Vercel button.
 
 ### Serverless (AWS Lambda)