adapted setup, agenda and basics; changed folder structure

demos/3_files_and_commands/image_montage.json

demos/3_files_and_commands/image_montage.yaml

demos/3_files_and_commands/image_montage_list.json

demos/3_files_and_commands/image_montage_list.yaml

demos/3_files_and_commands/image_rotation.json

demos/3_files_and_commands/image_rotation.yaml

demos/3_files_and_commands/image_swirl.json

demos/3_files_and_commands/image_swirl.yaml

demos/3_files_and_commands/image_swirl_list.json

demos/3_files_and_commands/tile-0.png

demos/3_files_and_commands/tile-1.png

demos/3_files_and_commands/tile-2.png

demos/3_files_and_commands/tile-3.png

docs/agenda.rst

docs/basics.rst

docs/setup.rst