Add start shell script (Follow-up from "Add gfz deployment")

The following discussion from !33 (merged) should be addressed:

• @kotyba.alhaj-taha started a discussion: (+1 comment)

  Please don't forget this steps:

  python manage.py migrate
  python manage.py loaddata initial_data.json
  python manage.py loaddata default_community_data.json
  python manage.py collectstatic --noinput

  Maybe we do a shell script for it.