docs: upgrade secret store diagram (#359)

Author: stijnmoreels

docs/preview/03-Features/secret-store/index.md

@@ -14,6 +14,8 @@ Once register, you can fetch all secrets by using `ISecretProvider` which will g
 
 > :bulb: See [this section](./azure-functions.md) if you want to use the secret store functionality within Azure Functions.
 
+![Arcus secret store integration example](/img/arcus-secret-store-diagram.png)
+
 ## Why would I use it?
 Why would you use our Arcus secret store instead of just using the Azure SDK directly to access Azure Key Vault secrets?
 

docs/preview/index.md

@@ -12,7 +12,7 @@ Arcus Security allows you to work easily with secrets. Instead of retrieving sen
 
 Additionally, Arcus Security makes sure that retrieved secrets are cached for a while so to avoid multiple calls to the backing secret provider, which prevents throttling.
 
-![Arcus secret store integration example](/img/secret-arcus-keyvault.png)
+![Arcus secret store integration example](/img/arcus-secret-store-diagram.png)
 
 # Guidance
 * [Add Arcus secret store with Azure Key vault integration](02-Guides/add-secret-store-with-keyvault-integration.md)