Add I18nManager docs

[scarlac]

Added to sidebar as well.
Related to react/react-native#51661 and react/react-native#51648

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[scarlac]

I'm not sure how I can address the build issue. I can reproduce it locally but the error doesn't make sense to me:

$ yarn && cd website && yarn build
...
Successfully generated output from ./sidebarsArchitecture.ts
{
  "totalUrls": 13,
  "unavailableUrls": []
}
Successfully generated output from ./sidebarsContributing.ts
{
  "totalUrls": 147,
  "unavailableUrls": [
    {
      "url": "https://reactnative.dev/docs/i18nmanager",
      "status": 404,
      "error": null
    }
  ]
}
Documentation generation skipped due to broken links

I don't see any direct or indirect mentions of i18nmanager in sidebarsContributing.ts
Any help is appreciated.

[Abbondanzo]

I'm not sure how I can address the build issue. I can reproduce it locally but the error doesn't make sense to me:

I just dealt with this in #4623. The fix required landing the same docs into 0.79's versioned_docs first before adding it to the sidebar

cc @szymonrybczak do you think you could make changes to your llm script to take new sidebar links into account to prevent blocking builds?

[szymonrybczak]

@Simek is there any way we could inject some env variable to the generate-llms-txt.js script with current deployment url, because it'll always fail on the PR branches. (even if we would check with /next prefix in the URL

[Simek]

@szymonrybczak It looks like you should be able to access the deployment URL via env vars according to:

• https://docs.netlify.com/configure-builds/environment-variables/#deploy-urls-and-metadata

Not sure tho, if this will be available before app build finishes, but let's tests it out.

[scarlac]

@Abbondanzo added here:
#4627

[scarlac]

Thank you for fixing the checks, @Simek . Looks like it passed now