Add Crawl4AI Assistant Chrome Extension

- Created manifest.json for the Crawl4AI Assistant extension.
- Added popup HTML, CSS, and JS files for the extension interface.
- Included icons and favicon for the extension.
- Implemented functionality for schema capture and code generation.
- Updated index.md to reflect the availability of the new extension.
- Enhanced LLM Context Builder layout and styles for consistency.
- Adjusted global styles for better branding and responsiveness.

docs/md_v2/assets/styles.css

@@ -28,7 +28,8 @@
     --secondary-color: #d5cec0;
     --tertiary-color: #a3abba;
     --primary-dimmed-color: #09b5a5; /* Updated to the brand color */
-    --primary-color: #0fbbaa; /* Updated to the brand color */
+    /* --primary-color: #0fbbaa; */
+    --primary-color: #50ffff; /* Updated to the brand color */
     --accent-color: rgb(243, 128, 245);
     --error-color: #ff3c74;
     --progress-bar-background: #3f3f44;