fix(react-native): repoint dead links and add missing official resources

[charpeni]

What

• Replace links that now 404: the Metro docs (facebook.github.io/metro), the removed "RAM Bundles and Inline Requires" page, and the removed Jest tutorial-react page
• Remove the GeeksforGeeks link, which the contributing guide does not accept
• Point Async Storage at the community package; reactnative.dev/docs/asyncstorage now says the API was removed from core
• Update environment setup links to the current "Set Up Your Environment" and "Get Started Without a Framework" pages
• Add official resources to topics that had none: Testing, View, Listings, ListViews, Understand Frame Rates
• Add the React Native DevTools, NetInfo, Fetch API and WebSocket docs where a topic only linked a generic article
• Tighten a few outdated sentences (LogBox, RAM bundles, react-test-renderer deprecation, community CLI) without lengthening descriptions

Verification

• Every added URL returns HTTP 200
• Link types follow the official / opensource / article ordering from the contributing guide, and no topic exceeds the link limit
• prettier --check passes on the touched files, except two pre-existing style issues (setext headings, * bullets) left untouched to keep the diff focused