[FIX - 539] - Update env_sample file adding a vite_secret_key property

[anevski-stefan]

Fixes Issue

My PR closes #539

👨‍💻 Changes proposed(What did you do ?)

• Updated the .env_sample adding a VITE_SECRET_KEY property

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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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