to better show what they do

- remove the article
- separate words by undersore
- add adjetive

so that there's no need to build the whole URL every time.
Also:
- stop converting back and forth dictionaries and json strings
- rename response to r
- return tuples when there's an error to know the error
- use inline if

and set comment as docstring.

ie. the python code and docker that is only for the GNUnet REST API and
not the docker for building a GNUnet docker image.

Squasing all nkls' commits and appling juga's MR:
https://gitlab.com/nkls_pep/gnunet-docker/-/merge_requests/1