Wrap manual setup in collapsed section

Address review feedback by wrapping the alternative manual setup
instructions in a <details> collapsed section, keeping the
recommended CLI path front and center.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: aryeila

README.md

@@ -58,7 +58,10 @@ lk agent init my-agent --template agent-starter-python
 
 The CLI clones the template and configures your environment. Then follow the rest of this guide from [Run the agent](#run-the-agent).
 
-Alternatively, clone the repository and install dependencies to a virtual environment:
+<details>
+<summary>Alternative: manual setup without the CLI</summary>
+
+Clone the repository and install dependencies to a virtual environment:
 
 ```console
 cd agent-starter-python
@@ -78,6 +81,8 @@ lk cloud auth
 lk app env -w -d .env.local
 ```
 
+</details>
+
 ## Run the agent
 
 Before your first run, you must download certain models such as [Silero VAD](https://docs.livekit.io/agents/build/turns/vad/) and the [LiveKit turn detector](https://docs.livekit.io/agents/build/turns/turn-detector/):