re-adding the images for step #1 and #3 in "Testing Subscription Offe…

…rs on the Simulator" section of App Store Sandbox doc (#607)

* Add files via upload

re-adding images for sandbox steps for app store #2 and #3

* adding image references to re-uploaded images

docs/test-and-launch/sandbox/apple-app-store.mdx

@@ -158,11 +158,11 @@ For sandbox and production [subscription offers](/subscription-guidance/subscrip
 ### Step 1: Finding your Subscription Offers Key
 Open the  `.storekit` file where the subscriptions offers are configured, and go to Editor → Subscription Offers Key.
 
-![Find Subscription Offers Key](https://github.com/RevenueCat/revenuecat-docs/assets/36222014/57cf8008-7c6e-4103-b8ad-6e4e2b9bb0a0)
+![Find Subscription Offers Key](/images/finding_subscriptions_offer_key_image_1.png)
 
 After selecting 'Subscription Offers Key', you will see your key ID and private key.
 
-![Key ID and private key](https://github.com/RevenueCat/revenuecat-docs/assets/36222014/e83f6f2e-e4dc-4354-874f-27281f7e1acf)
+![Key ID and private key](/images/finding_subscriptions_offer_key_image_2.png)
 
 Note that the private key stored in the “.storekit” file is unique per file and Xcode allows you to re-generate the key for a given file. If you re-generate your key, be sure to follow these steps again to upload your new key to RevenueCat.
 
@@ -174,7 +174,7 @@ We only accept files smaller than 512B. We recommend utilizing an editor such as
 ### Step 3: Upload your file to RevenueCat
 This file can now be uploaded to the RevenueCat dashboard under your iOS app settings page → Storekit Subscription Offer Key. Be sure to copy and paste over your key ID from Xcode to the `Key ID` box.
 
-![Add key ID](https://github.com/RevenueCat/revenuecat-docs/assets/36222014/44dfcdcb-ccc0-46a3-80e6-68b887f68f38)
+![Add key ID](/images/upload_your_file_to_revenuecat_image.png)
 
 Don't forget to click 'Save Changes' in the upper right.