> v1.2.0 -> v1.2.1

## Summary

Documentation gets restructured into a dedicated directory with a new Preview section, and legacy demo assets are removed.

## Changes

### DOC
- Add Preview section, relocate assets, and bump package to 1.2.1 (@pardnchiu) [301655d]

<details>
<summary>翻譯</summary>

- 新增 Preview 章節、搬移資源檔案，並將套件版本提升至 1.2.1

</details>

### CHORE
- Restructure documentation into doc/ and remove legacy demo assets (@pardnchiu) [8c76e2c]

<details>
<summary>翻譯</summary>

- 將文件重構至 doc/ 目錄並移除舊有的 demo 資源

</details>

## Scope

- `doc/` — DOC, CHORE
- `package.json` — DOC

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