Repo refers to internal identifiers that start with 'logseq_db_' and
used to start with 'logseq_local_'. The --repo option was not being
used in that way and was just a reference to a graph name. While it's
reasonable for internal CLIs like db-worker-node.js to use --repo, it is
needlessly confusing to introduce repo to users. Almost all of our apps and docs
label graphs as 'graph' and not 'repo'
