Docs: Add link to discussionon stdout redirection, from @bnmnetp.

Author: bjones1

docker/docker_tools_misc.py

@@ -89,7 +89,7 @@ def _start_servers(dev: bool) -> None:
         'sudo -u www-data env "PATH=$PATH" "REDIS_URI=$REDIS_URI" '
         "poetry run celery --app=scheduled_builder worker --pool=threads "
         "--concurrency=3 --loglevel=info "
-        # This redirect ensures output ends up in the Docker log even if the servers are restarted. Sending to ``/dev/stdout`` only works at initial startup, but doesn't redirect after the servers are restarted.
+        # This redirect ensures output ends up in the Docker log even if the servers are restarted. Sending to ``/dev/stdout`` only works at initial startup, but doesn't redirect after the servers are restarted. For more discussion, see `Github <https://github.com/moby/moby/issues/19616#issuecomment-174355979>`_.
         "--logfile=/proc/1/fd/1 &",
         cwd=f"{env.RUNESTONE_PATH}/modules",
     )

pyproject.toml

@@ -36,6 +36,7 @@ pathlib2 = "^2.0.0"
 Paver = ">= 1.2.4"
 # This is actually an rsmanage dependency. It's here so that rsmanage can be installed without installing this, which requires Postgres (available only in the container).
 pgcli = "^3.0.0"
+pretextbook = "^0.7"
 psycopg2-binary = "^2.0.0"
 pylint = ">= 1.2.1"
 python = "^3.8"