Update index.md

[serverizzo]

update yarn add to npx expo install

Description

Related issues

Release Summary

Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/\*\*/e2e
  • jest tests added or updated in packages/\*\*/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

Test Plan

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Name	Status	Preview	Comments	Updated (UTC)
react-native-firebase	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 19, 2025 7:54pm

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[mikehardy]

Hi there - I understand react-native in general is moving to "Expo first", but our documentation still supports people running in a non-Expo manner

Most of the docs have an Expo and non-Expo install / config section for that reason - but this just takes over all of the install and makes it 100% Expo, which doesn't really fit

I'd love to see an Expo-specific install section for firestore here but it'll need to be either in it's own section, or as a mention in this section that Expo does it this way, non-Expo does it that way...