docs: update MiniPay quickstart wagmi examples to v2

[GigaHierz]

What

Updates the "Using Wagmi" section of the MiniPay quickstart (build-on-celo/build-on-minipay/quickstart.mdx) from wagmi v1 to wagmi v2, the current major version.

Why

The quickstart still taught the wagmi v1 pattern (new InjectedConnector() + useConnect({ connector })), which no longer matches current wagmi. The page was also internally inconsistent — it showed the v1 class pattern in one snippet and a v2-style injected({ target: "metaMask" }) call a few lines later, with incomplete imports.

This came out of a review of #2193, which proposed adding a separate wagmi v2 section to code-library.mdx. That page's snippets are already viem v2 and current, so rather than duplicate setup guidance there, the v2 patterns are folded into the quickstart where wallet setup naturally belongs.

Changes

• Replace the v1 InjectedConnector pattern with a complete wagmi v2 setup: createConfig + WagmiProvider + QueryClientProvider, plus a config-driven useConnect() auto-connect snippet (the connector passed to connect() is the one registered in createConfig — no mismatch).
• Add a <Note> callout explaining the v1→v2 differences (functions vs classes, WagmiConfig→WagmiProvider, createConfig).
• Complete the imports in the "hide connect button" example and add connect to the effect deps so it's internally consistent.

RPC uses bare http() and celo from wagmi/chains, consistent with the rest of the docs.

Note: #2193 can be closed in favor of this; its useful v2 patterns are incorporated here.

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