Expand the Solana doc

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https://github.com/zeta-chain/docs/blob/3e0d743ea2db0d469dbacd28c2a71551f322342a/src/pages/developers/chains/solana.mdx

Mention Solana gateway functions like in the EVM doc:

https://github.com/zeta-chain/docs/blob/3e0d743ea2db0d469dbacd28c2a71551f322342a/src/pages/developers/chains/evm.mdx

Describe on a high-level how to interact with gateway on Solana (code might change, so make sure the doc is high level, the code is for reference here):

https://github.com/zeta-chain/toolkit/blob/585aedb6fe3372b14e80f4d710ffb508773624b9/packages/client/src/solanaDeposit.ts

Link to a successful deposit on Solana on devnet explorer and show how to understand if a tx was successful.

Add a section on setting up Solana wallet to the getting started doc:

https://github.com/zeta-chain/docs/blob/3e0d743ea2db0d469dbacd28c2a71551f322342a/src/pages/developers/tutorials/intro.mdx