Rebuild English version of Jupyter Book

[termoshtt]

より新しい日本語のJupyter Bookを機械翻訳によって英語版を生成します

TODO

• introduction.ipynb
• quickstart/openjij.ipynb
• quickstart/scip.ipynb
• references/cheat_sheet.ipynb
• references/tips.ipynb
• tutorials/constraint_and_penalty.ipynb
• tutorials/creating_models.ipynb
• tutorials/expressions.ipynb
• tutorials/types_and_bounds.ipynb