`<Tip>` customization request

[LysandreJik]

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 <Tip> directive to specify different colors.

For example here, the <Tip> 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 <Tip> should be more than enough.

[julien-c]

sounds like a great/simple idea to me