Part of [Create a public laconicd testnet](https://www.notion.so/Create-a-public-laconicd-testnet-896a11bdd8094eff8f1b49c0be0ca3b8)
- Add instructions to setup stage2 laconicd deployment
- Add instructions for stage1 to stage2 migration
- Add a script and instructions for users to upgrade their nodes to testnet stage2
Reviewed-on: #31
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>