[First PR · Docs] Surface the narrated tour in the contributor quick-start

[Ayush-Kumar0207]

Why this is a good first contribution

This is a tiny documentation-only task. No local application setup, backend, database, Docker, Redis, or AI configuration is required.

Context

CodeVerse now publishes a narrated product tour at /demo-video, while the contribution guide mainly points newcomers straight into setup and the interactive app. A first-time contributor should be able to watch the 76-second tour before deciding what part of the repository to touch.

Your task

Update contributor-facing documentation so the narrated tour is easy to find before local setup.

Please:

• add a short Watch the 76-second tour link near the top of CONTRIBUTING.md pointing to https://codeverse-rho.vercel.app/demo-video;
• keep the existing live-app and issue links;
• add /demo-video to the README project-structure route list if it is still missing;
• avoid rewriting unrelated README or contribution copy.

Likely files

• CONTRIBUTING.md
• README.md

Definition of done

• a newcomer can reach the narrated tour before installing dependencies;
• wording clearly distinguishes the narrated tour from the interactive /demo workspace;
• only the relevant documentation lines change;
• all links are valid Markdown/HTML.

Minimum verification

Preview the Markdown and run:

npm run audit:repo

If you'd like to take this, comment I'd like to take this.