feat: add Donation Modal as menu item

[xoRmalka]

Solution for #422

Description

• Added a Donation Modal that opens when the donation menu item is clicked.

• Created a DonateModal component based on the existing DonationButton.

• Updated MainMenu to include a conditional check for the donation menu item.

• Used e.preventDefault() to prevent URL change when clicking the donation menu item.

• Integrated the DonateModal into the MainMenu component.

• Ensured that donation links in the modal open in a new tab.

screenshots

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