docs(landing-page): brand NEW landing page

[SoonIter]

Summary

Tasks

• kickoff: static XL size landing page
• i18n
• click event
• responsive layout: L -> M -> S
• dark mode
• animation (I'll ask for animation files in this step I think)
• extract the shared components (e.g Tool Stack) to other websites (Rsbuild,Rsdoctor, etc)

// XL 1440
// L 1280
// M 834
// S 393

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[SoonIter]

"extract the shared components"
I think rspress theme is a better choice because it is a homepage and it can be used like

---
pageType: homepage
---

[chenjiahan]

I think rspress theme is a better choice because it is a homepage and it can be used like

Some sites may need to customize the page or theme, so providing components makes it easier to compose.

[chenjiahan]

The theme variables seems to be broken:

[SoonIter]

The theme variables seems to be broken:

It is okay on my machine :D

[SoonIter]

The theme variables seems to be broken:

I think it is related to css order and not my fault, lol

[chenjiahan]

Get, I can not reproduce this theme issue too..