Add documentation for the Alephium provider

[lf94]

This is to support https://github.com/WalletConnect/walletconnect-monorepo/pull/940

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Name	Status	Preview	Updated
walletconnect-docs	✅ Ready (Inspect)	Visit Preview	May 25, 2022 at 0:55AM (UTC)

[pedrouid]

Docs have been drastically refactored