audit and update solo/local node docs for hashsphere release

**description:**

the current docs for solo and local node is outdated and needs an audit and update before the upcoming hashsphere release. the existing content is incomplete, and some information is missing

this issue tracks the effort to review and update all relevant documentation pages to ensure they are accurate, complete, and aligned with the hashsphere release.

**identified these pages as priority**

- [ ] https://docs.hedera.com/hedera/networks/localnet
- the solo section on the main localnet page is a placeholder with "more info coming soon..."
- there is no dedicated documentation for solo setup, configuration, or usage. we can just link out to solo docs
- [ ] https://docs.hedera.com/hedera/tutorials/local-node