update logo src

Author: lispking

src/cover.md

@@ -11,5 +11,5 @@
 ![cover](./images/cover.png)
 
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-    <p><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License" src="https://i.creativecommons.org/l/by-nc-nd/4.0/88x31.png"></a></p>
+    <p><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License" src="https://licensebuttons.net/l/by-nc-nd/4.0/88x31.png"></a></p>
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src/intro.md

@@ -81,5 +81,5 @@ Rust 的安全性也导致完全没有标题为“永远不要…”的条目。
 [第19条]: https://www.lurklurk.org/effective-rust/reflection.html
 
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+    <p><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License" src="https://licensebuttons.net/l/by-nc-nd/4.0/88x31.png"></a></p>
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src/intro_zh.md

@@ -43,5 +43,5 @@ Rust 以其安全性和类型系统，在编程语言的世界中独领风骚。
 通过持续翻译分享《Effective Rust》，我们将一起深入 Rust 的世界，掌握 Rust 编程的精髓，为未来的软件开发铺就一条坚实的道路。
 
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+    <p><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/4.0/"><img alt="Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License" src="https://licensebuttons.net/l/by-nc-nd/4.0/88x31.png"></a></p>
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