Add Japanese translation of chapter 1/4 to 6

[haruki-N]

I created three files translated into Japanese: 4, 5, and 6.mdx of chapter1.

[younesbelkada]

Thanks a lot for the great translation!
As you can see a small test is failing, could you make sure to update the _toctree.yml as following ;) (you can check also here)

[ArthurZucker]

🤗 Great work! Thanks a lot 🇯🇵

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[younesbelkada]

Thanks a lot for the great translation!
In terms of content, that looks great to me 🔥 ! As stated in #359 I am just waiting the moon-ci to be back, check the frontend results and we should be good to merge! 💪
Thanks a lot!

[lewtun]

Hey @haruki-N thanks a lot for your translation 🤗 ! We just merged #359 which means there are some conflicts with the table of contents - would you mind resolving them and pushing again?

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint.

[younesbelkada]

hey @haruki-N , I have addressed the issue!
Thanks again for the amazing contribution !!