Feature - fixedShaped funnel with customizable neck height/width

[bdknox]

feat(funnel) - Option to make the funnel chart a fixed shape with customizable neck width/height to more directly resemble a funnel shape.

Three new props for Funnel:

1. fixedShape: boolean
2. neckHeightRatio: number - only applicable when fixedShape is true
3. neckWidthRatio: number - only applicable when fixedShape is true

fixedShape.funnel.demo.mov

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nivo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 9, 2023 11:34pm

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[plouc]

The feature can be previewed here.

[plouc]

@bdknox, I haven't reviewed the PR yet, but looking at the website preview, it seems like borders don't work anymore.

[bdknox]

Sorry about that @plouc, I meant to mention that in the PR description and have some documentation on it. I left it without supporting the borders for now because of how borders are currently implemented and how it looks with this shape of the funnel. They clip into the previous parts as seen below. I can look into it if you'd prefer for borders to be supported for this format as well. Otherwise I'll add some info to the PR description and the website info under the fixedShape input