End of beta - UI changes

[jagodarybacka]

What

Prepare app for the end of beta season, changes when IS_BETA_CLOSED = true are:

• countdown shows time left to claim XP

• there are no challanges visible

• staking is impossible

• There is a hint below the claimable XP

• there are no "stake to join realm" or "you are already staked in another realm" banners visible (as it is no longer possible to stake)

Testing

• [x] with IS_BETA_CLOSED = true test changes listed above
• [x] with IS_BETA_CLOSED = false - there should be no changes compared to prod env

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