Fix TailwindCSS docs to Tailwind 4.0

[Danvictorgithub]

📚 Subject area/topic

/guides/styling-components/tailwind.mdx

📋 Page(s) affected (or suggested, for new content)

https://docs.solidjs.com/guides/styling-components/tailwind

📋 Description of content that is out-of-date or incorrect

The current documentation in the tailwind section, is "outdated"(implemented in Tailwind 3.0). The new installation process of tailwind (now 4.0) no longer uses npx tailwind init -p, instead they are now allowing it directly configuring on css.

🖥️ Reproduction in StackBlitz (if reporting incorrect content or code samples)

No response

[Danvictorgithub]

I would like to add that, although tailwind released 4.0, I think there should be an opt in for 3.0 (providing tailwindcss@3), reason being is that ui components like the unofficial shadcn for solidjs is still supporting 3.0 and also because shadcn haven't migrated to the latest version of tailwind