Minor rework of python modularization documentation

...dularization/python-modularization_01_code-modularity.png

...odularization/python-modularization_02_example-folder.png

...dularization_03_example-folder-changes-module-manager.png

...style/modularization/python-modularization_04_main-01.png

...style/modularization/python-modularization_05_main-02.png

...ization/python-modularization_06_datapreprocessing-01.png

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...zation/python-modularization_08_datapostprocessing-01.png

...zation/python-modularization_09_datapostprocessing-02.png

.../python-modularization_10_example-folder-changes-user.png

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...yle/modularization/python-modularization_12_toml_file.png

docs/get-involved/modularization/python-modularization.md

...on-template/AircraftDesign/cost_estimation/CMakeLists.txt

...emplate/AircraftDesign/cost_estimation/cost_estimation.py

...e/AircraftDesign/cost_estimation/cost_estimation_conf.xml

.../AircraftDesign/cost_estimation/src/datapostprocessing.py

...e/AircraftDesign/cost_estimation/src/datapreprocessing.py

...plate/AircraftDesign/cost_estimation/src/readlayertext.py

...ing_cost_estimation_tu_berlin/general/methodhtmlreport.py