docs: remove banner image from README for cleaner presentation

- Eliminated the centered banner image to streamline the README layout.
- Adjusted the content for improved readability and focus on project information.

README.md

@@ -1,8 +1,4 @@
 <div align="center">
-<a href="https://tapdata.io/">
-<img src="./assets/tapdata-banner.jpg" width="900px"/>
-</a>
-<br/><br/>
 
 [![Release](https://img.shields.io/github/v/tag/tapdata/tapflow.svg?sort=semver)](https://github.com/tapdata/tapflow/releases)
 [![PyPI Downloads](https://static.pepy.tech/badge/tapflow)](https://pepy.tech/projects/tapflow)