python: Move everything to this folder

Because in the next commit, I'm going to add LaTex templates, and it will
be better to have everything well organised.
latex/templates/course_notes.tex: Basic LaTex template

this is the one I use when taking notes from books or online courses.
latex/templates/course_notes.tex: Add example of how to include images

I personally prefer to have a separate folder for the images.
notes/software_sustems_architecture: Start taking notes
notes: Add Makefile to generate pdf files

This way I won't forget what command to use (pdflatex), and in the case
that I need to split something in different tex files, `make pdf` will
generate the pdf only for those files specified in its rule and will ignore
the rest of them.