Add instructions for using psql to view the local database

[jenweber]

No description provided.

[ef4]

You can eliminate the need for a local psql binary by using the one that's inside the docker container:

docker exec -it cardstack-pg sql -U postgres pgsearch_cardboard_development

This also guarantees you'll have the right version of psql.

[jenweber]

For me this works as docker exec -it cardstack-pg psql -U postgres pgsearch_cardboard_development

[jenweber]

Edited to include Ed's suggestions!