Add aria-label on story links

[geromegrignon]

Is this a regression?

No

Description

Story links aren't accessible.

Please provide a link to a minimal reproduction of the bug

https://geromegrignon.github.io/angular-material-storybook/?path=/docs/components-form-field-overview--page

Please provide the exception or error you saw

No response

Please provide the environment you discovered this bug in

No response

Anything else?

No response

Do you want to create a pull request?

Yes