fix: remove db credentials logging; feat: add docker-compose example

[vanvuongngo]

fix security issue

• remove logging of sensitive database credentials (if needed log url but w/o user/password at the starting)

Before

Starting Hindsight API...
  Version: v0.4.9
  URL: http://0.0.0.0:8888
  Database: postgresql://hindsight_user:12345678PASSWORD@db:5432/hindsight

INFO - hindsight_api.migrations - Database URL: postgresql://hindsight_user:12345678PASSWORD@db:5432/hindsight

INFO - hindsight_api.engine.memory_engine - Connecting to PostgreSQL at postgresql://hindsight_user:12345678PASSWORD@db:5432/hindsight

After

Starting Hindsight API...
  Version: v0.4.9
  URL: http://0.0.0.0:8888

DEBUG - hindsight_api.migrations - Database URL: postgresql://hindsight_user:12345678PASSWORD@db:5432/hindsight

DEBUG - hindsight_api.engine.memory_engine - Connecting to PostgreSQL at postgresql://hindsight_user:12345678PASSWORD@db:5432/hindsight

feature

• add docker-compose example

[vanvuongngo]

If required, I can create separated PRs but both are small and related.

[vanvuongngo]

will create separated PR to be open for questions

[vanvuongngo]

see #313 and #312