Composer composability

[wileyj]

Description

This is a major change to refactor this entire project. Gone: reliance on knowing docker-compose commands.

• Adding controller script as manage.sh
• Change directory structure
• Added private-testnet for a detached testnet network
• Default configs vs templates (configs are copied if they don't exist)
• Baselined Readme so it's not hardcoded per branch
• No need for specific branches for each network. main branch can do it all
• Simplify postgres setup - no longer necessary to add users/schemas, will default to using postgres as the DB and the username
• Shutdown in correct order to prevent data corruption
• Data persistence is stored per network

Does this introduce a breaking change?

Yes. Anyone using this repo will have to wipe any current data and resync. Once this initial resync is complete, persistent data can be reused.