Update index text

[webmaster128]

Motivation for those changes:

• The use of Wasmer is an implementation detail that can change at any time
• In the broader ecosystem of VMs (there are many now), CosmWasm shines when it comes to Cosmos SDK and IBC integration
• The Wasm compiler is not a very strong argument for Rust. I think the language is also very good for high precision code, which I tried to express here
• A contract is not a client to the chain (not external like a wallet), so I changed that to account

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Name	Status	Preview	Comments	Updated (UTC)
cosmwasm-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 28, 2024 10:12am

[hashedone]

LGTM