Add direnv shorthands, minor cleanup

.envrc

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# This file is loaded with `direnv`.
+# It enters you into the poetry venv, removing the need for `poetry run`.
+
+poetry run true # create venv if it doesn't exist
+export VIRTUAL_ENV=$(poetry env info --path)
+export POETRY_ACTIVE=1
+PATH_add "$VIRTUAL_ENV/bin"