Format readthedocs

[jwaa]

Is your feature request related to a problem? Please describe.
Given the completion of the documentation (see #165), the readthedocs pages should be reviewed on their formatting.

Describe the solution you would like
A nice and readable documentation structure that is consistent throughout.

Describe alternatives you have considered
N/A

Additional context
N/A

[thaije]

The documentation was completely broken, because of the renaming and reordering of our files. The documentation was still looking for matrxs and other non-existent files and folders. This has been fixed now.

Writing down for future reference:
See for example this page. These classes were not clickable, because they referred to non-existent files.

I also discovered a peculiarity with the Sphinx documentation:
See for example this page. The individual methods of the class are not clickable, if the class itself does not have a short description.

Thus, the method of the following class is not clickable, and will thus not show the detailed documentation of the class' methods:

Class Test():

def method1(self):
    """ All methods properly documented
    ....
    """

This will also not work:

Class Test():
"""
A wonderful class description on the second line.
"""
def method1(self):
    """ Properly documented 
    ....
    """

This does work:

Class Test():
""" A wonderful class description on the first line. 
More detailed explanation here.
"""
def method1(self):
    """ Properly documented 
    ....
    """

[thaije]

@jwaa Nice work with the documentation :) Pages like the ones for the Move action look great

[jwaa]

@thaije Do you have the time (and hours) to work on this issue for the next release?

[thaije]

@jwaa I do have some hours, however I am also tight on time coming weeks. My priority for now is fixing #154 , #182, #179. After those are done I can take a look at this, however I don't have a guarantee that it will be next week.

[jwaa]

Then I move this issue to the milestone of v1.2.0

[thaije]

Done with commit 42a91fa