[guide] improve local rust hello world

[nickfrosty]

Problem

the rust hello world guide should be improved after feedback during a DX test

Proposed Solution

• add clear instructions on installing the solana cli locally - https://solana.com/developers/guides/getstarted/local-rust-hello-world#install-rust-and-cargo
• add instructions on creating the local keypair before running the validator
• add instructions for airdropping on running the local validator
• add info around needing to create a keypair and airdrop before running the program deploy command here https://solana.com/developers/guides/getstarted/local-rust-hello-world#deploy-your-solana-program

[michaelcrypt0x]

I think basic inputs are missing in cargo.toml for the project to compile (dependencies and dev-dependencies )