When adding blender-related code to online docs, the code must be extracted from a python file which is located in pyddg/examples/.... This way, the code snippets are tested!!! (e.g. see pyddg/docs/source/visualization/blender/animation.rst)
This can also be done for blender unrelated snippets, but it doesn't have to.
Convention for the name of rst files: exactly the same name as the headline of the corresponding article
