issue #272 added feature watch demo functioning gssoc25 level3

[Divyasharma11245]

Changes Made:

• Added a new DemoVideo.jsx page to display the demo video in a card layout.
• Embedded YouTube video using iframe.
• Styled the page according to existing website design (consistent with headers, buttons, and container).
• Added "Back to Home" button matching the "Watch Demo" button style.
• Updated routes in App.jsx to include /demo path for the new page.

Testing:

• Navigated from "Watch Demo" button → opens the new demo page.
• Verified responsiveness and styling across screen sizes.
• YouTube video plays correctly inside the embedded card.

15.09.2025_00.27.12_REC.mp4

Additional Notes:

• No environment variables were used; no sensitive info included.
• Compatible with dark/light theme.

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[Divyasharma11245]

Please merge this pull request

[Roshansuthar1105]

@Divyasharma11245 resolve the pr conflicts and add the link as instructed.