`<Tip>` customization request

Each repository has its own needs in terms of features; Hugging Face Hub, for example, now requires the `versionadded` and `versionchanged` directives. However, these likely take some time to implement.

When working on the `huggingface_hub` documentation, a workaround that I would have found sufficient is the ability to customize the `` directive to specify different colors.

For example here, the `` has the same color for the `versionadded` directive:

And the `raises` directive:

Ideally, to allow enough time for the design to emerge on doc-builder's side, customizing the `` should be more than enough.