chore: add docker configuration for local development

[Shubham15986]

Description

This PR introduces the Docker configuration required to run the frontend inside a container. It is designed to work seamlessly with the central docker-compose.yml orchestration file located in the RECursionNITD-website backend repository.

Changes Made

• Dockerfile: Added a lightweight Node 20 container to run the React development server. It includes aggressive timeout and retry configurations for npm install to prevent transient ECONNRESET network drops during the initial build phase.
• .dockerignore: Added to keep the massive node_modules and local build outputs out of the container context.

Note to Reviewers

This repository is orchestrated from the backend. The backend's compose file automatically mounts the local src/ and public/ directories into this container to enable seamless hot-reloading for frontend developers, while automatically injecting the correct REACT_APP_BACKEND_URL environment variables.

Note: This PR must be merged at the exact same time as the corresponding Backend Docker PR. The central docker-compose.yml orchestrator that uses this new Dockerfile is located over in the backend repository.

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