Demo Video Creation, Integration

[Rohitkk432]

create a demo video popup(close on clicking outside) on first time a user onboards the website with Github.
And make a button to get the video popup again which is places above the "Airdrop Devnet SOL" button

Create the demo video using videos in the following google drive
and share the created video link via drive link in Pull Request.

https://drive.google.com/drive/folders/1beYDfgOcDeUwBmxswm1VHN1asnNbrgVM?usp=sharing

give as much detail as possible in the pull request.

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