Update deploy button

README.md

@@ -2,9 +2,10 @@
 
 This Rails starter project fully integrates with dynamic sample content from your ButterCMS account, including main menu, pages, blog posts, categories, and tags, all with a beautiful, custom theme with already-implemented search functionality. All of the included sample content is automatically created in your account dashboard when you sign up for a free trial of ButterCMS.
 
-<!-- TODO: Add link to the demo once deployed -->
 You can view a [live demo hosted on Heroku](link-to-demo), or you can click the button below to deploy your own copy of our starter project to the provider of your choice.
 
+[![Heroku Deploy Button](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/ButterCMS/rails-starter-buttercms/tree/main&env%5BRAILS_BUTTER_CMS_API_KEY%5D=check%20https://buttercms.com/settings)
+
 ## 1. Installation
 Make sure you have ruby version 3.1.0 installed. Otherwise, follow the official [instructions](https://www.ruby-lang.org/en/documentation/installation/) on how to set up ruby on your machine.
 ```
@@ -40,7 +41,7 @@ Congratulations! Your starter project is now live. To view your project, point y
 
 Deploy your Rails app using Heroku. With the click of a button, you'll create a copy of your starter project in your Heroku account, instantly deploy it, and institute a full content workflow connected to your ButterCMS account. Smooth.
 
-[![Heroku Deploy Button](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/ButterCMS/rails-starter-buttercms/tree/main)
+[![Heroku Deploy Button](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy?template=https://github.com/ButterCMS/rails-starter-buttercms/tree/main&env%5BRAILS_BUTTER_CMS_API_KEY%5D=check%20https://buttercms.com/settings)
 
 ## 5. Previewing Draft Changes