chore: remove leverage banners

[janndriessen]

Summary of Changes

• Removes Leverage Arb banners - as the campaign ends

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• I have updated my repository to match the master at IndexCoop/index-app.
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Name	Status	Preview	Comments	Updated (UTC)
index-app	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 3, 2024 1:24pm

[janndriessen]

Closing in favor of https://github.com/IndexCoop/index-app/pull/1528