docs(tutorial): add UTM param to Gatsby Cloud links (#31422)

Author: meganesu

docs/docs/tutorial/part-0/index.mdx

@@ -325,7 +325,7 @@ The final step in this part of the tutorial is to create accounts for the online
 In this Tutorial, you will deploy your site using Gatsby Cloud. To use Gatsby Cloud, you will need to set up a GitHub account and a Gatsby Cloud account. (Both accounts are free!)
 
 * [Create a GitHub account.](https://github.com/join) GitHub is a website for storing your Git codebases (also called Git repositories).
-* [Create a Gatsby Cloud account.](/dashboard/signup/) Gatsby Cloud is a platform designed to be the best way to build and deploy your Gatsby sites.
+* [Create a Gatsby Cloud account.](/dashboard/signup/?utm_campaign=tutorial) Gatsby Cloud is a platform designed to be the best way to build and deploy your Gatsby sites.
 
 ## Summary
 

docs/docs/tutorial/part-1/index.mdx

@@ -236,7 +236,7 @@ Gatsby Cloud is an infrastructure platform that is specifically optimized for bu
 
 To connect your code on GitHub to your Gatsby Cloud account, do the following:
 
-1. Go to your [Gatsby Cloud Dashboard](https://gatsbyjs.com/dashboard/). Click on the **"Add a site"** button.
+1. Go to your [Gatsby Cloud Dashboard](/dashboard/?utm_campaign=tutorial). Click on the **"Add a site"** button.
 
    ![An empty Gatsby Cloud dashboard](./01-create-a-site-button.png)
 

docs/docs/tutorial/part-2/index.mdx

@@ -780,7 +780,7 @@ git commit -m "Finished Gatsby Tutorial Part 2"
 git push
 ```
 
-Once your changes have been pushed to GitHub, Gatsby Cloud should notice the update and rebuild and deploy the latest version of your site. (It may take a few minutes for your changes to be reflected on the live site. Watch your build's progress from your [Gatsby Cloud dashboard](/dashboard).)
+Once your changes have been pushed to GitHub, Gatsby Cloud should notice the update and rebuild and deploy the latest version of your site. (It may take a few minutes for your changes to be reflected on the live site. Watch your build's progress from your [Gatsby Cloud dashboard](/dashboard/?utm_campaign=tutorial).)
 
 </Announcement>