chore: remove logo and favicon's background & generate favicon tool

[Young-Lord]

至于为什么，开着夜间模式看一下就知道了 以及这个logo分辨率是不是有点低？

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[renbaoshuo]

由于本人技术不过关，如果您有兴趣的话，可以尝试将 Logo 转为 SVG 格式的来提升清晰度。