[docs] Add Development tools and Navigation section in Home

[amandeepmittal]

Why

This PR updates the Home > Develop section by adding

• Tools for development guide
• Navigation section which is an introduction to create Stack and tab layouts with Expo Router and gives a brief overview on how to use dynamic routes based on an example.
• Merges Splash screen and app icons pages. Update the content of this guide to make it more actionable and follow the new default template. Also, add redircts for the deleted /app-icon, /splash-screen pages.

Test Plan

Run docs locally and start with: http://localhost:3002/develop/tools/ or see Preview.

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for npx expo prebuild & EAS Build (eg: updated a module plugin).

[expo-bot]

📘 Your docs preview website is ready!

[Simek]

Great work on those guides Aman! 👌

Let's ship it, and iterate in the future on the content, if needed.

[jonsamp]

I ran this locally. I agree with @Simek , let's ship it! Thanks for getting this out!