docs: refactor / future-proof Laravel installation instructions

[1000nettles]

I was running through the Laravel installation docs and stumbled on the step to copy / paste the updated Tailwind config file. I noticed that this overwrites specific properties which are added with the shadcn installation (for example, prefix.) Most importantly, the config to copy / paste no longer adheres to Tailwind config types, specifically:

keyframes: {
        "accordion-down": {
          from: { height: 0 },
          to: { height: "var(--radix-accordion-content-height)" },
        },

height should now be considered a string.

I figured for future proofing it'd just be easiest to instruct on adding back the Laravel-specific properties to the config file.

[vercel]

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