refacto(py-doc): remove Python doc build

BREAKING CHANGE: doc job removed
this job has to been rewritten :
	- it is in a wrong stage
	- needs an other tool (make)
	- generated doc is not publish anywhere
	- no ability to choise doc generation tool

in to-be-continuous, there is mkdocs template which is able to generate python doc too

# Conflicts:
#	templates/gitlab-ci-python.yml