docs: update icon (#37)

* docs: update icon
* fix: missing icon

Author: timerring

README-en.md

@@ -1,7 +1,14 @@
-# bilitool
+<div align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="assets/headerDark.svg" />
+    <img src="assets/headerLight.svg" alt="bilitool" />
+  </picture>
+  <p> </p>
 
 [简体中文](./README.md) | English
 
+</div>
+
 > Welcome to use, provide feedback, and contribute to this project via PRs. Please do not use it for purposes that violate community guidelines.
 
 `bilitool` is a Python toolkit that provides features such as persistent login, video download, and video upload to Bilibili. It can be used via command-line interface (CLI) or as a library in other projects.

README.md

@@ -1,7 +1,14 @@
-# bilitool
+<div align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="assets/headerDark.svg" />
+    <img src="assets/headerLight.svg" alt="bilitool" />
+  </picture>
+  <p> </p>
 
 简体中文 | [English](./README-en.md)
 
+</div>
+
 > 欢迎使用，欢迎提供更多反馈，欢迎 PR 贡献此项目，请勿用于违反社区规定的用途。
 
 `bilitool` 是一个 python 的工具库，实现持久化登录，下载视频，上传视频到 bilibili 等功能，可以使用命令行 cli 操作，也可以作为其他项目的库使用。