Add Circle and Bankr cryptocurrency wallets to community examples

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Changes

Adds two cryptocurrency wallet implementations to Community AWS projects section following the pattern established in #3 (Omniwallet):

New Examples:

• Circle Wallet - Programmable wallet platform with USDC support, social login, and recovery features
• BankrWallet - AI-powered browser extension supporting Ethereum, Base, Polygon, and Unichain

Dictionary Updates:

• Added Bankr, crypto, Ethereum, Unichain, USDC to spellcheck allowlist

Screenshot

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