LINUX - REMOVING DIRECTORIES
The short answer
To remove an entire directory or folder, including the files and subdirectories it contains, you can use the rm command with the -r flag (short for recursive):
$ rm -r directory
Forcing the removal of directories with rm -f
$ rm -rf directory
Note that in case the directory belongs to another user, you'll have to use the sudo command to gain elevated privileges in order to remove it.
$ sudo rm -rf directory