docs: improve local setup instructions in README

[im-vedant]

Summary

• Updated README prerequisites to specify Node.js v16
• Improved installation steps with correct npm install sequence (matching CI workflow)
• Added step to copy local environment file to environment.ts
• Updated local start command to npm start

Issue: PSMRI/AMRIT#111

Test plan

• Follow README steps end-to-end and verify the app starts at http://localhost:4200/#/login
• Verify cp src/environments/environment.local.ts src/environments/environment.ts works before npm start

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Run ID: 8271d2f1-5a94-431a-9a31-6fc3c31277dc

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Reviewing files that changed from the base of the PR and between df5db19 and e38c4c9.

📒 Files selected for processing (1)

• README.md

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