Feat: configurable landing page

[Muska-Ami]

related: #1223
This PR added a config option to control if display landing page.

nuxt.config.ts:

export default defineNuxtConfig({
  docus: {
    enableLandingPage: false, // Default: true
  }
})

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[pkg-pr-new]

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npm i https://pkg.pr.new/create-docus@1245

npm i https://pkg.pr.new/docus@1245

commit: 6f2adb6