readme: integrate the docker-based development setup from the main's doc
Also:
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docker-compose: move the swh-indexer-journal-client in the journal "section"
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swh-scheduler: add SWH_CONFIG_FILENAME and SWH_SCHEDULER_CONFIG_FILE env vars
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in all the swh-scheduler related services. Also configure the CELERY_BROKER_URL env var.
These allow to use the swh-scheduler directly in the container without any cmdline option, as well as the celery command.
Migrated from D1221 (view on Phabricator)