Update README.md

Author: raold

README.md

@@ -1,9 +1,7 @@
 <div align="center">
   <img src="docs/logo.png" alt="Second Brain Logo" width="400">
 
-  SecondBrain v4.2.0 🧠
-  
-  **PostgreSQL + pgvector Unified Architecture**
+  **SecondBrain v4.2.0 🧠**
 
   [![Docker](https://img.shields.io/badge/docker-%230db7ed.svg?style=flat&logo=docker&logoColor=white)](https://docker.com/)
   [![PostgreSQL](https://img.shields.io/badge/PostgreSQL-16+-blue.svg)](https://www.postgresql.org/)