Delete all files & exports from the filesystems in different environments

[pavliuc75]

dev env has files that have to be moved to accommodate the new file structure
the script (method) is in the main file of spring project.

relates to #167

It was decided that all files and existing exports from our environments should be deleted.
The database rows will be deleted automatically as the flyway database migration runs.
To delete the actual files, it is necessary to ssh to each server separately and delete them manually (we delete all files in the root folder EXCEPT for /studies folder)