adapted setup, agenda and basics; changed folder structure

demos/2_data_flow/foreach_task.json

demos/2_data_flow/foreach_task.yaml

demos/2_data_flow/pytask.json

demos/2_data_flow/pytask.yaml

demos/3_files_and_commands/capitalA.png

demos/3_files_and_commands/command_line_task.json

demos/3_files_and_commands/command_line_task.yaml

demos/3_files_and_commands/command_line_task_wf.json

demos/3_files_and_commands/command_line_task_wf.yaml

demos/3_files_and_commands/file_transfer_task.json

demos/3_files_and_commands/file_transfer_task.yaml

demos/3_files_and_commands/foreach_task_cmd.json

demos/3_files_and_commands/foreach_task_cmd.yaml

demos/3_files_and_commands/image_animate.json

demos/3_files_and_commands/image_animate.yaml

demos/3_files_and_commands/image_mirror_horizontally.json

demos/3_files_and_commands/image_mirror_horizontally.yaml

demos/3_files_and_commands/image_mirror_vertically.json

demos/3_files_and_commands/image_mirror_vertically.yaml

demos/3_files_and_commands/image_montage+swirl.json