refactor (folder): reorganizing folders

feat (small challenges): new small challenges static

feat (class/relationship): resolution of the exercise

feat (release): relationship example

feat (release): adjusts in the lab

feat (lab/oo): new release and improvements in the lab

feat (binder): new release

feat (binder): new release

feat (jupyter / lab): exception lab

feat (release v1.0.6) & fix (jupyter / eclipse): interface lessons