Add OKX wallet info

[okxwallet]

Add OKX wallet

Related Issue

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[corwintines]

https://github.com/ethereum/ethereum-org-website/issues/new?assignees=&labels=product+%F0%9F%A7%B0,wallet+%F0%9F%91%9B&projects=&template=suggest_wallet.yaml&title=Suggest+a+wallet

Hey @okxwallet,

Thanks for submitting this. I can't find an issue to go along with this, could you fill out this issue template so that we can review properly.

[konopkja]

@okxwallet at minimum we need to know what L2 rollups are supported