Migration changes

docs/v13/documentation/migrate-an-existing-prototype.md

@@ -1,23 +1,29 @@
 ---
-heading: Migrate an existing prototype to version 13 with the migration script
+heading: Migrate an existing prototype to version 13
 title: Migrate an existing prototype to version 13
 ---
 
-1. Install Node.js version 18.
+1. If you do not already have it, [install Node.js version 18](https://nodejs.org/en).
 
-2. In the terminal, delete the folder `node_modules` (doing this first will make the backup quicker).
+2. In the terminal, change to your prototype folder. 
 
-3. Make a backup of your prototype folder. You can do this in Finder or Windows Explorer.
+3. Run this command to delete your node modules folder:
 
-4. In the [terminal](./install/requirements#terminal), `cd` to your prototype folder.
+    `rm -rf node_modules`
 
-5. Run this command:
+4. Make a backup of your prototype folder. You can do this in Finder or Windows Explorer.
 
-`npx govuk-prototype-kit@13 migrate`
+5. In your prototype folder, run this command in the terminal:
+
+    `npx govuk-prototype-kit@13 migrate`
 
 6. If some migration steps fail, the script will report these.
 
-If this is the case, [contact the GOV.UK Prototype team](./support).
+    If this is the case, [contact the GOV.UK Prototype team](./support).
+
+7. If you are using Git, commit these changes.
+
+>To run the kit enter `npm run dev` in your terminal (this used to be `npm start`).
 
 ## If your prototype does not work