docs: remove extra badge

Author: jonahsnider

readme.md

@@ -10,8 +10,6 @@ Cache the Next.js build folder in Netlify builds.
 
 A [popular](https://www.netlify.com/blog/2020/06/22/top-10-netlify-build-plugins/#4-next-js-cache) [Netlify build plugin](https://docs.netlify.com/configure-builds/build-plugins/).
 
-[![add to netlify](https://img.shields.io/badge/add%20to-netlify-00AD9F)](https://app.netlify.com/plugins/netlify-plugin-cache-nextjs/install)
-
 ## Usage
 
 This is a Netlify build plugin, which will run during your Netlify builds. You can learn more about Netlify Build Plugins in the [Netlify docs](https://docs.netlify.com/configure-builds/build-plugins/).