Copy docs/ja to docs/en

Author: termoshtt

docs/en/_config.yml

@@ -22,7 +22,7 @@ bibtex_bibfiles:
 # Information about where the book exists on the web
 repository:
   url: https://github.com/Jij-Inc/JijModeling-Tutorials # Online location of your book
-  path_to_book: docs/en # Optional path to your book, relative to the repository root
+  path_to_book: docs/ja # Optional path to your book, relative to the repository root
   branch: main # Which branch of the repository should be used when creating links (optional)
 
 # Add GitHub buttons to your book

docs/en/_toc.yml

@@ -2,23 +2,29 @@
 # Learn more at https://jupyterbook.org/customize/toc.html
 
 format: jb-book
-root: getting_started
+root: introduction
 parts:
   - caption: Switch Language
     chapters:
-      - url: https://jij-inc.github.io/JijModeling-Tutorials/ja/
-        title: 日本語
-  - caption: "Tutorials"
+      - url: https://jij-inc.github.io/JijModeling-Tutorials/en/
+        title: English
+  - caption: "クイックスタート"
+    chapters:
+      - file: quickstart/scip
+      - file: quickstart/openjij
+  - caption: "チュートリアル"
     chapters:
       - file: tutorials/creating_models
       - file: tutorials/types_and_bounds
       - file: tutorials/expressions
       - file: tutorials/constraint_and_penalty
-  - caption: "References"
+  - caption: "リファレンス"
     chapters:
+      - url: https://jij-inc.github.io/JijModeling-Tutorials/apis/jijmodeling.html
+        title: "jijmodeling API Reference"
       - file: references/tips
       - file: references/cheat_sheet
-  - caption: "Release Notes"
+  - caption: "リリースノート"
     chapters:
       - file: releases/jijmodeling-1.8.0
       - file: releases/jijmodeling-1.9.0