Bug: Add Viem + Wagmi guides for Flashblocks

[jxom]

Describe the bug

x

Steps

1. Visit https://docs.base.org/chain/flashblocks/apps
2. Viem + Wagmi is "coming soon", but it's already here!
   a. see: https://x.com/_jxom/status/1927366613994455362

Expected behavior

A guide for Viem + Wagmi :)

Additional info

No response

Environment

No response