Beta end modal

[xpaczka]

Ref #875 Ref #876

What has been done

• Added "Beta has ended" modal on top of the map
• Added "Portal is closed" modal on the onboarding page
• Set flags to prevent users from entering the map, when portal is closed
• Automatically clear onboarded wallet when portal is closed

What is missing

• Link to claim Galxe NFT
• Endpoint for "Sign up" form

Testing

• [x] Set IS_BETA_CLOSED flag to true
• [x] "Beta has ended" modal is on top of the map
• [x] Modal can be closed
• [x] Set IS_PORTAL_CLOSED flag to true
• [x] Onboarded wallet is cleared from localStorage
• [x] "Portal is closed" modal is on the onboarding page
• [x] Population count is not visible
• [x] Is it not possible to connect the wallet

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[jagodarybacka]

On a side note - once we have the email thing - would be nice to clear the input on success and show some success message

[xpaczka]

On a side note - once we have the email thing - would be nice to clear the input on success and show some success message

Will take care of it when I start working on the logic when I have the endpoint. Updated description for: #878