Clean repo

docker-compose/etherpad.yml

docker-compose/kanboard.yml

docker-compose/mysql.yml

old/debian/Dockerfile-buster

old/debian/Dockerfile-stretch

old/grafana/Dockerfile

old/grafana/README.md

old/pica-bot/Dockerfile

old/pica-bot/mattermost_bot_settings.py

old/pica-bot/picasoft/__init__.py

old/pica-bot/picasoft/plugins/__init__.py

old/pica-bot/picasoft/plugins/discussion.py

old/pica-bot/picasoft/plugins/link.py

old/pica-gchange/Dockerfile

old/pica-tellform/Dockerfile

old/pica-tellform/docker-compose.yml

old/pica-tellform/entrypoint.sh

old/pica-tellform/tellform-patch.patch

pica-tellform/Dockerfile