Refine home page: simplify hero snippet and reorder sections

Use base e2b SDK instead of code-interpreter, simplify to create +
run command, add API key comment, move "What is E2B?" to top, and
add description to Computer Use example card.

Author: beran-t

docs.mdx

@@ -6,29 +6,29 @@ icon: house
 
 import { Quickstart } from '/snippets/Quickstart.jsx';
 
+## What is E2B?
+
+E2B provides isolated sandboxes that let agents safely execute code, process data, and run tools. Our SDKs make it easy to start and manage these environments.
+
 Spin up a sandbox and run code in a few lines:
 
 <CodeGroup>
 ```javascript JavaScript & TypeScript
-import { Sandbox } from '@e2b/code-interpreter'
+import { Sandbox } from 'e2b'
 
-const sandbox = await Sandbox.create()
-const execution = await sandbox.runCode('print("Hello, World!")')
-console.log(execution.logs)
+const sandbox = await Sandbox.create() // Needs E2B_API_KEY environment variable
+const result = await sandbox.commands.run('echo "Hello from E2B Sandbox!"')
+console.log(result.stdout)
 ```
 ```python Python
-from e2b_code_interpreter import Sandbox
+from e2b import Sandbox
 
-sandbox = Sandbox.create()
-execution = sandbox.run_code('print("Hello, World!")')
-print(execution.logs)
+sandbox = Sandbox.create()  # Needs E2B_API_KEY environment variable
+result = sandbox.commands.run('echo "Hello from E2B Sandbox!"')
+print(result.stdout)
 ```
 </CodeGroup>
 
-## What is E2B?
-
-E2B provides isolated sandboxes that let agents safely execute code, process data, and run tools. Our SDKs make it easy to start and manage these environments.
-
 ## E2B Building Blocks
 
 A quick overview of the core building blocks you'll interact with when using E2B.
@@ -54,5 +54,7 @@ The documentation is split into three main sections:
 ## Examples
 
 <CardGroup cols={2}>
-  <Card title="Computer Use" icon="desktop" href="/docs/use-cases/computer-use" />
+  <Card title="Computer Use" icon="desktop" href="/docs/use-cases/computer-use">
+    Build AI agents that see, understand, and control virtual Linux desktops using E2B Desktop sandboxes.
+  </Card>
 </CardGroup>