docs: update favicon

Author: ChenZiHong-Gavin

README.md

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 [English](README.md) | [简体中文](README_zh.md)
 
 <p align="center">
-  <img src="resources/images/favicon.png" width="200" height="200" style="border-radius: 50%">
+  <img src="resources/images/favicon-border.png" width="200" height="200">
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 ```text

README_zh.md

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+# GraphGen: Enhancing Supervised Fine-Tuning for LLMs with Knowledge-Driven Synthetic Data Generation
+
+[English](README.md) | [简体中文](README_zh.md)
+
+<p align="center">
+  <img src="resources/images/favicon.png" width="200" height="200" style="border-radius: 50%">
+</p>
+
+```text
+├── baselines/           # baseline methods
+├── cache/               # cache files
+│   ├── data/            # generated data
+│   ├── logs/            # log files
+├── configs/             # configuration files
+├── graphgen/            # GraphGen implementation
+│   ├── operators/       # operators
+│   ├── graphgen.py      # main file
+├── models/              # base classes
+├── resources/           # static files and examples
+├── scripts/             # scripts for running experiments
+├── templates/           # prompt templates
+├── utils/               # utility functions
+├── webui/               # web interface
+└── README.md
+```
+
+## Introduction
+
+GraphGen is a framework for synthetic data generation guided by knowledge graphs.
+
+### Workflow
+![workflow](resources/images/flow.png)
+
+### User Interface
+![ui](resources/images/interface.jpg)