This will alliviate the merge conflicts we keep getting by checking this
file into source control.
-----------
Now, when using docker-compose, to re-generate the `styles.css` file,
you can do so locally in the following ways:
1. locally run `yarn build`
2. run `docker compose build`
This includes running containers for mailman-core and mailman-web, both
connecting to the same database used by the boost web site.
The branch proposes a minor refactoring for the shared usage of the
compose-start.sh script, allowing both the boost web server and the mailman-web
server to wait for the db, run migrations, collect assets and run the django
devserver.
