docs: add vite google analytics in .env_sample

[sumitnair26]

Fixes Issue

**My PR closes #652 **

👨‍💻 Changes proposed(What did you do ?)

I have added VITE_GOOGLE_ANALYTICS on .env_sample file

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• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title and description of the PR is clear and explains the approach.

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[Dun-sin]

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