Various fixes

The first letter of the title "Analyse morphologique" was not capitalized, which is inconsistent with the usual capitalization rules for titles.

🖼️ chore(README.md): update image and fix typo in rotation instructions The image in the README.md file was updated to reflect the correct rotation instructions. A typo in the rotation instructions was also fixed.

👥 chore(README.md): fix typo in contributor's role A typo in the role of one of the contributors was fixed.

🐛 fix(data_processing.py): add missing half discretisation values to L calculation The calculation of L in the get_advanced_data function of data_processing.py was missing half the discretisation values at the beginning and end of the object.

🐛 fix(input.py): remove print statement A print statement was accidentally left in the from_xyz_file method of the ScannedObject class in input