* docs(update): add TypeScript next to JavaScript in the introduction definition
* docs(add): add content about integration with existing apps.
* Update src/data/roadmaps/react-native/content/100-introduction/100-what-is-react-native.md
* Update src/data/roadmaps/react-native/content/100-introduction/index.md
* Update src/data/roadmaps/react-native/content/100-introduction/101-why-react-native.md
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Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>