Update README.md

center menu and badges

Author: recursix

README.md

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 ![AgentLab Banner](https://github.com/user-attachments/assets/a23b3cd8-b5c4-4918-817b-654ae6468cb4)
 
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 [![pypi](https://badge.fury.io/py/agentlab.svg)](https://pypi.org/project/agentlab/)
 [![PyPI - License](https://img.shields.io/pypi/l/agentlab?style=flat-square)]([https://opensource.org/licenses/MIT](http://www.apache.org/licenses/LICENSE-2.0))
 [![PyPI - Downloads](https://img.shields.io/pypi/dm/agentlab?style=flat-square)](https://pypistats.org/packages/agentlab)
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 [🤖 Build Your Agent](#-implement-a-new-agent) &nbsp;|&nbsp;
 [↻ Reproducibility](#-reproducibility) 
 
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 https://github.com/ServiceNow/BrowserGym/assets/26232819/e0bfc788-cc8e-44f1-b8c3-0d1114108b85
 
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 AgentLab is a framework for developing and evaluating agents on a variety of
 [benchmarks](#-supported-benchmarks) supported by
 [BrowserGym](https://github.com/ServiceNow/BrowserGym).