Add Manage Portfolio Component with Enhanced Navigation and UI Improvements

[RachitSahu26]

Introduce a new Manage Portfolio component to improve the user experience in crypto portfolio management. Updates include the integration of the component into the main application, a dedicated Portfolio page, and enhanced visual elements.

'fixed #471' @vanshchauhan21 Done

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🎉🎉 Thank you for your contribution! Your PR #769 has been merged! 🎉🎉