fix: resolve StorybookConfig import error and update deprecated CLI commands

[ozgegurel]

This PR fixes two issues that were causing build errors and deprecation warnings.

Issue 1: Deprecated CLI Command Warnings

Deprecated npx react-native init command was causing warnings:

🚨️ The init command is deprecated. Switch to npx @react-native-community/cli init for the identical behavior.

What I did

• Updated the README to use the current React Native CLI command npx @react-native-community/cli init instead of the deprecated one npx react-native init

How to test

Try the new command format:

npx @react-native-community/cli init MyApp --template react-native-template-storybook

Issue 2: StorybookConfig Import Error

When creating a new project using this template and running npm run storybook, the following error occurs:

SyntaxError: The requested module @storybook/react-native does not provide an export named StorybookConfig

What I did

• Changed to TypeScript type-only import to fix the compilation error
  from import { StorybookConfig } to import type { StorybookConfig }

How to test

1. First create a project and install dependencies:

npx @react-native-community/cli init TestApp --template react-native-template-storybook
npm install --legacy-peer-deps

2. Run storybook and observe the error:

npm run storybook

It gives StorybookConfig error:

3. After fixing the TypeScript error, the template-generated TestApp project works correctly without errors:

npx @react-native-community/cli init TestApp --template file://$(pwd)
cd TestApp && npm install --legacy-peer-deps
npm run storybook 

Should work fine.