Fix website versions page to links to correct language & delete unused file

[endiliey]

Summary

1. Fix website versions page to links to correct language. This is because current versions page always point to english docs despite being in another language.
   Check https://jestjs.io/ro/versions links and you'll see that documentation links points to /en/

2. Modify .gitignore & delete i18n/en.json because it will always be auto-generated from Docusaurus. No need to keep it in the repository

3. Delete publish-gh-pages.js because this is not needed anymore. This is an old remnant file from old Docusaurus version

Extra motivation:
Test netlify deploy preview is now working for new PR

Test plan

Before

After

[codecov-io]

Codecov Report

Merging #6734 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6734   +/-   ##
=======================================
  Coverage   63.68%   63.68%           
=======================================
  Files         235      235           
  Lines        9007     9007           
  Branches        4        3    -1     
=======================================
  Hits         5736     5736           
  Misses       3270     3270           
  Partials        1        1

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[thymikee]

Links are correct now, but I cannot access docs in foreign language on Netlify, e.g. https://deploy-preview-6734--jest-preview.netlify.com/docs/ro/api
It works on prod: https://jestjs.io/docs/en/api

[endiliey]

@thymikee
If you try another Jest's PR netlify preview, example: https://deploy-preview-6716--jest-preview.netlify.com/docs/es-ES/getting-started

or even Docusaurus's PR netlify preview
https://deploy-preview-867--docusaurus-preview.netlify.com/docs/zh-CN/installation

It cannot found the docs as well.

This is because for netlify deploy preview, we don't run the whole crowdin-upload, crowdin-download which makes the i18n docs available. Only for production

[thymikee]

Oh, ok that makes sense. Somehow I missed that!

[thymikee]

Mind adding a changelog entry? :)

[endiliey]

How do you want it to be written ? Kinda unsure on the wordings 😭

[thymikee]

Use PR title "Fix website versions page to link to correct language", that'll do

[thymikee]

Thanks!

[github-actions]

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