docs: clarify parallel execution for dev servers in setup

[Mohit-001-hash]

Summary

This PR improves the developer onboarding experience by clarifying the setup instructions in the README.md. Previously, the commands to start the backend and frontend development servers were listed in a single code block. Because npm run dev is a blocking continuous process, a contributor copying and pasting the whole block would get stuck, and the UI server would never start. I have separated these into explicitly marked terminal instructions so it is clear they need to be run in parallel.

Closes #None

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Type of Change

• Bug fix
• New feature
• Refactor (no functional change)
• Documentation update
• UI / style improvement
• Tests
• Config / CI / tooling

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What Was Changed

• Updated the "Develop from this repository" section in README.md.
• Separated the npm run dev and npm run dev:ui commands into distinct "Terminal 1" and "Terminal 2" steps.
• Grouped the build command as an optional step at the end.

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How to Test

1. Open the README.md file.
2. Navigate to the Installation > Develop from this repository section.
3. Verify that the markdown clearly delineates running the backend and frontend servers in separate terminal windows.

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Checklist

• My code follows the project's TypeScript conventions
• npm run lint passes (no TypeScript errors)
• I have tested my changes locally
• I have added comments where the code is complex or non-obvious
• I have updated relevant documentation (if applicable)
• This PR is linked to an open issue

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Screenshots (if UI change)

Before	After
N/A	N/A

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Related Issues / PRs

None

[Mohit-001-hash]

Can you please add the gssoc approved label without it I won't get gssoc points