finished exercise 5, moved files in exercise 3

...cises/demos/3_files_and_commands/image_montage+swirl.json

exercises/demos/3_files_and_commands/image_swirl_list.json

exercises/inputs/5_author_firetask/parameters.json

exercises/inputs/5_author_firetask/parameters.yaml

...cises/problems/5_author_firetask/dataloader+repeater.json

exercises/problems/5_author_firetask/dataloader.json

exercises/problems/5_author_firetask/parameters.json

exercises/problems/5_author_firetask/recruiting-script.py

exercises/solutions/5_author_firetask/custom_tasks.py

exercises/work/1_control_flow/.gitkeep

exercises/work/2_data_flow/.gitkeep

exercises/work/3_files_and_commands/.gitkeep

exercises/work/4_wflow_append/.gitkeep

exercises/work/5_author_firetask/.gitkeep