Remove deleted modules from documentation

These modules were deleted in 835bcdf and 2262bf9.
Reorganise wmfr_photography to be importable without breaking

Pure scripts are annoying as in they cannot be imported without
executing themselves.
This resulted in a broken build, as all modules are imported
(in order to compute test coverage).

Convert it to module-like feature to fix that.
PEP8-ify it while we are at it.
Add tox command to generate the Sphinx documentation

Makes it easier to run the documentation generation
as a tox test environment (not executed by default)
This notably takes care of the dependencies.
Improve docstring in package main file