[Documentation Update]: Add npm run build and npm run start instructions to contributing.md

[dhairyathedev]

Is there an existing issue for this?

• [X] I have searched the existing issues

Issue Description

The current contributing.md file does not mention that contributors should run npm run build and subsequently npm run start to prevent errors during the deployment process. This omission can lead to issues that could be avoided with proper instructions.

Suggested Change

Update the contributing.md file to include a section that instructs contributors to run npm run build and npm run start before submitting their pull requests. This will ensure that they catch any build-related errors early in the development process.

Rationale

No response

Urgency

High

Record

• [X] I have read the Contributing Guidelines
• [X] I'm a GSSOC'24 contributor
• [X] I have starred the repository