docs(buttons): update icon button docs

[panch1739]

This PR updates the button docs to start introducing the square variant.

@kfenner I'm unsure whether we should start documenting the variant slowly...perhaps just by mentioning its existence first. Later, we can add more context, such as when to use the square versus the circle variant.
To do this properly, I’ll need to go through each component, compare it with IX, and uncover the underlying pattern.

I’ve updated the Figma file, so the correct styling is now available. However, I couldn’t find the PR where this variant was introduced in the code...so im unsure if creating a separate issue to align the styling.

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[github-actions]

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[kfenner]

@panch1739 Great start, thank you 🙏

@dauriamarco Can you make sure this is aligned with your implementation efforts and gets merged at the same time?

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[panch1739]

@panch1739 Great start, thank you 🙏

@dauriamarco Can you make sure this is aligned with your implementation efforts and gets merged at the same time?

@kfenner This PR was done at beginning november...but since then, we have figured out where to integrate them. I have here the full updated docs... #1218. Should we close this PR and directly go with the full docs?

[github-actions]

[panch1739]

@spike-rabbit I realised that we need to close this PR, as is already outdated, in favor of #1218