feat: more interesting homepage themes

[ceynri]

As expected, the homepage can be designed with a variety of different experimental themes, allowing users to switch themes on the page (random or selection list).

some ideas:

• grid layout
  • such as https://github.com/Ladvace/astro-bento-portfolio
• threejs effect
• pixel style
  • font ref: https://elmagnifico.tech/2025/03/19/Bitmap-Font/
• more effect from v1
  • https://github.com/ceynri/ceynri.cn/tree/v1
• Live2D
• oiiai cat meme