Hello from the Netlify Docs team!

I’m proposing a small update to your README. The goals:
- Ensure that users learn how to install through the Netlify UI
- Align it with some recent changes we’ve made to our [file-based installation instructions](https://docs.netlify.com/configure-builds/build-plugins/#file-based-installation) for Build Plugins

Feel free to edit and merge as you see fit.