feat: Add Bandit Network to dApp promotions

[tripsy-eth]

Pull Request Summary

Updates dapp_promotions.json to add Bandit Network's promotion, boosting visibility for its Web3 campaign dashboard.

Changes:

Adds

• Bandit Network details to dapp_promotions.json.
• Promotional image to dapp_promotions directory.

[Kahonnohak]

Hi thanks, I cannot see the promotional event? We promote dApps using this card when you have something to offer to users

[impelcrypto]

Closed this PR since there is no update