docs: rewrite typst-docs-web README in English (#275)

Author: 3w36zj6

website/typst-docs-web/README.md

@@ -1,14 +1,76 @@
-# website
+# typst-docs-web
+
+<div align="center">
+  <img src="./images/preview.png" alt="">
+</div>
+
+Build a website from the documentation JSON file generated by [typst-docs](https://github.com/typst/typst/blob/main/docs/Cargo.toml#L2).
+
+## Required toolchains
+
+- [Node.js](https://nodejs.org/)
+- [Bun](https://bun.sh/)
+
+Using [mise](https://mise.jdx.dev/) is recommended, as it enables central management of all the toolchains required for both the SSG and the upstream typst-docs.
+
+```toml
+# mise.toml
+[tools]
+rust = "1.83.0" # set required version for typst-docs
+node = "22.11.0"
+bun = "1.2.21"
+```
+
+## Setup
 
 > [!NOTE]
-> このドキュメントは執筆中です。
+> The JSON structure generated by typst-docs is not stable and may change at any time. This project is confirmed to be compatible with typst-docs [v0.13.1](https://github.com/typst/typst/tree/v0.13.1). Other versions are usually compatible as well, but they have not been tested carefully.
+
+The typst-docs CLI outputs the static files required for building the documentation. Place the JSON file and assets generated by typst-docs in the `/public/` directory. In most use cases, symbolic links are convenient.
+
+```sh
+# Run in the root directory of typst/typst repository
+cargo run --package typst-docs -- --assets-dir assets --out-file docs.json --base /docs/
+```
+
+```plaintext
+public
+├── assets ⇒ /path/to/typst/assets
+└── docs.json ⇒ /path/to/typst/docs.json
+```
+
+Create `/public/metadata.json` and describe the metadata for the documentation website. For details on each property, refer to the JSON schema. For example:
+
+```json
+{
+  "$schema": "../metadata.schema.json",
+  "language": "ja-JP",
+  "version": "0.13.1",
+  "typstOfficialUrl": "https://typst.app",
+  "typstOfficialDocsUrl": "https://typst.app/docs/",
+  "githubOrganizationUrl": "https://github.com/typst-jp",
+  "githubRepositoryUrl": "https://github.com/typst-jp/docs",
+  "discordServerUrl": "https://discord.gg/9xF7k4aAuH",
+  "originUrl": "https://typst-jp.github.io/",
+  "basePath": "/docs/",
+  "displayTranslationStatus": true
+}
+```
+
+`/public/translation-status.json` is used to manage the translation progress and the classification of original content. This file is automatically updated when running the SSG, so manual editing is not necessary.
 
 ## Commands
 
+After installing dependencies with Bun, the following commands are available:
+
+```sh
+bun install --frozen-lockfile
+```
+
 ### Develop
 
 > [!NOTE]
-> 全文検索のインデックスは[pagefind](https://pagefind.app/)で生成していますが、インデックスの出力先が`dist/`になっているため、現在は開発サーバーで全文検索が機能しません。検索機能関連の開発をする場合は、`bun run build`を実行してから、`bun run preview`でビルド後の状態を確認してください。
+> The full-text search index is generated by [pagefind](https://pagefind.app/), but since the output directory is set to `/dist/`, full-text search functionality is currently unavailable in the development server. For developing search-related features, please execute `bun run build` first, then use `bun run preview` to inspect the built output.
 
 ```sh
 bun run dev
@@ -29,10 +91,10 @@ bun run preview
 ### Check
 
 ```sh
-# コードスタイルをチェックする
+# Check code style
 bun run check
 
-# 自動修正を行う
+# Apply automatic code fixes
 bun run check:write
 ```
 
@@ -41,3 +103,13 @@ bun run check:write
 ```sh
 bun run test
 ```
+
+## Maintainers
+
+- [@3w36zj6](https://github.com/3w36zj6)
+
+## License
+
+This project is derived from [typst/typst](https://github.com/typst/typst) and is licensed under the Apache-2.0 license.
+
+Non-OSS assets distributed by the Typst web app are not included in this project.