feat: use experimental `nuxt.schema` to define app config

[pi0]

Use experimental nuxt-config-schema to define app config from nuxt.schema.ts. This way we can annotate documentation and have custom resolvers for appConfig.

input:

export default defineNuxtConfigSchema({
  appConfig: {
    cover: '/cover.jpg',
    socials: {
      /** Twitter handle */
      twitter: '',
      /** Github repository name */
      github: '',
    }
  }
})

output: (.nuxt/schema/nuxt.schema.d.ts)

export interface NuxtUserConfig {
   appConfig: {
    /** @default "/cover.jpg" */
    cover: string,

    socials: {
       /**
        * Twitter handle
        * @default ""
       */
       twitter: string,

       /**
        * Github repository name
        * @default ""
       */
       github: string,
    },
  },
}

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[atinux]

Closing sice implemented in latest commits, thanks!