Update README

Author: junegunn

README.md

@@ -1,15 +1,3 @@
-<div align="center" markdown="1">
-   <sup>Special thanks to:</sup>
-   <br>
-   <a href="https://www.warp.dev/?utm_source=github&utm_medium=referral&utm_campaign=vim-plug">
-      <img alt="Warp sponsorship" width="400" src="https://github.com/user-attachments/assets/ab8dd143-b0fd-4904-bdc5-dd7ecac94eae">
-   </a>
-
-### [Warp, the intelligent terminal for developers](https://www.warp.dev/?utm_source=github&utm_medium=referral&utm_campaign=vim-plug)
-[Available for MacOS, Linux, & Windows](https://www.warp.dev/?utm_source=github&utm_medium=referral&utm_campaign=vim-plug)<br>
-
-</div>
-<hr>
 <h1 title="vim-plug">
   <picture>
     <source media="(prefers-color-scheme: dark)" srcset="./plug-dark.png">