refactor(docs): reorganize documentation structure and update styles

Reorganize documentation into core/advanced/extraction sections for better navigation.
Update terminal theme styles and add rich library for better CLI output.
Remove redundant tutorial files and consolidate content into core sections.
Add personal story to index page for project context.

BREAKING CHANGE: Documentation structure has been significantly reorganized

docs/md_v2/api/strategies.md

@@ -218,12 +218,12 @@ result = await crawler.arun(
 
 ## Best Practices
 
-1. **Choose the Right Strategy**
+1. **Choose the Right Strategy**
    - Use `LLMExtractionStrategy` for complex, unstructured content
    - Use `JsonCssExtractionStrategy` for well-structured HTML
    - Use `CosineStrategy` for content similarity and clustering
 
-2. **Optimize Chunking**
+2. **Optimize Chunking**
    ```python
    # For long documents
    strategy = LLMExtractionStrategy(
@@ -232,7 +232,7 @@ result = await crawler.arun(
    )
    ```
 
-3. **Handle Errors**
+3. **Handle Errors**
    ```python
    try:
        result = await crawler.arun(
@@ -245,7 +245,7 @@ result = await crawler.arun(
        print(f"Extraction failed: {e}")
    ```
 
-4. **Monitor Performance**
+4. **Monitor Performance**
    ```python
    strategy = CosineStrategy(
        verbose=True,  # Enable logging