feat(defineConfig): enable conditional return

[ineshbose]

resolves #842

[what-the-diff]

PR Summary

• Enhanced Configuration Flexibility in tailwind.config.ts File
  This change includes an update in the tailwind.config.ts file, utilizing the newly defined defineConfig function imported from src/config.ts. This enhancement improves the flexibility of configuration management.

• Determination of Running Context within the defineConfig Function
  New logic has been implemented in the defineConfig function. This decides if the current context is Nuxt, a popular framework for developing Vue.js applications, and changes how configurations are processed accordingly.

• Tailored Configuration Based on Running Context
  We've improved the defineConfig function further to return configurations suited to the specific running context. This means it can respond differently based on whether it's being run as a main file or within a Nuxt Environment. This upgrade improves our ability to handle different scenarios with maximum efficiency.

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[ineshbose]

@danielroe

Could I get a review here possibly?

The use-case is for IntelliSense - if it is used in Nuxt build-time, just return the defined config.

If it is being loaded from the IntelliSense plugin, return .nuxt/tailwind/postcss.mjs contents which will in-turn re-import this file/config, so if it is being imported from there, return the object instead of trying to re-require postcss.mjs causing a cyclic import.

Quite fragile stuff, but I'm thinking I could ship it and based on feedback, remove it if not helpful as it is a non-app functionality feature/change.