update readme-assets directory name

07-container-registries/README.md

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 A container registry is a repository, or collection of repositories, used to store and access container images. They serve as a place to store and share container images between developer systems, continuous integration servers, and deployment environments.
 
-![](./images/container-registry.jpg)
+![](./readme-assets/container-registry.jpg)
 
 Examples of popular container registries include:
 
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 If available, Docker can also store the credentials in a secure store (`macOS keychain`, `Windows Credential Manager`) to help protect those credentials.
 
-![](./images/credential-helper.jpg)
+![](./readme-assets/credential-helper.jpg)