Incorrect Link to CONTRIBUTING.md file

[SanjeebLama]

I came across an issue with the link provided on the website to the CONTRIBUTING file.

Website : https://www.tailwind-variants.org/docs/getting-started#contributing.
The link currently leads to https://github.com/nextui-org/tailwind-variants/blob/main/CONTRIBUTING, which results in a 404 error.

It appears that the link should be https://github.com/nextui-org/tailwind-variants/blob/main/CONTRIBUTING.md.

I wanted to bring this to your attention so that it can be fixed, as it may prevent others from being able to contribute to the project. Thank you for your attention to this matter.