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

crawl4ai/async_crawler_strategy.py

@@ -453,12 +453,7 @@ class BrowserManager:
 
         return browser_args
 
-    async def setup_context(
-        self,
-        context: BrowserContext,
-        crawlerRunConfig: CrawlerRunConfig,
-        is_default=False,
-    ):
+    async def setup_context(self, context: BrowserContext, crawlerRunConfig: CrawlerRunConfig = None, is_default=False):
         """
         Set up a browser context with the configured options.
 
@@ -516,16 +511,17 @@ class BrowserManager:
 
         # Add default cookie
         await context.add_cookies(
-            [{"name": "cookiesEnabled", "value": "true", "url": crawlerRunConfig.url}]
+            [{"name": "cookiesEnabled", "value": "true", "url": crawlerRunConfig.url if crawlerRunConfig else "https://crawl4ai.com/"}]
         )
 
         # Handle navigator overrides
-        if (
-            crawlerRunConfig.override_navigator
-            or crawlerRunConfig.simulate_user
-            or crawlerRunConfig.magic
-        ):
-            await context.add_init_script(load_js_script("navigator_overrider"))
+        if crawlerRunConfig:
+            if (
+                crawlerRunConfig.override_navigator
+                or crawlerRunConfig.simulate_user
+                or crawlerRunConfig.magic
+            ):
+                await context.add_init_script(load_js_script("navigator_overrider"))
 
     async def create_browser_context(self):
         """