docs: Fix collapsible sections

- Make Common Parameters collapsible (as it's lengthy reference material)
- Keep CLI Installation visible (important for users to see immediately)
- Better information hierarchy

README.md

@@ -68,7 +68,7 @@ uv pip install leann
 
 <details>
 <summary>
-<h3>🔧 Build from Source (Recommended for development)</h3>
+<strong>🔧 Build from Source (Recommended for development)</strong>
 </summary>
 
 
@@ -166,7 +166,8 @@ ollama pull llama3.2:1b
 
 </details>
 
-### Common Parameters (Available in All Examples)
+<details>
+<summary><strong>📋 Click to expand: Common Parameters (Available in All Examples)</strong></summary>
 
 All RAG examples share these common parameters:
 
@@ -187,6 +188,8 @@ All RAG examples share these common parameters:
 --top-k N               # Number of results to retrieve (default: 20)
 ```
 
+</details>
+
 ### 📄 Personal Data Manager: Process Any Documents (`.pdf`, `.txt`, `.md`)!
 
 Ask questions directly about your personal PDFs, documents, and any directory containing your files!
@@ -398,8 +401,7 @@ Once the index is built, you can ask questions like:
 
 LEANN includes a powerful CLI for document processing and search. Perfect for quick document indexing and interactive chat.
 
-<details>
-<summary><strong>🔧 Click to expand: Installation Options</strong></summary>
+### Installation
 
 If you followed the Quick Start, `leann` is already installed in your virtual environment:
 ```bash
@@ -416,8 +418,6 @@ uv tool install leann
 leann --help
 ```
 
-</details>
-
 
 
 ### Usage Examples