Deleted 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/05.fermat-application/07.fermat-application-level-up/portal.en.md, 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/05.fermat-application/07.fermat-application-level-up/portal.es.md, 01.curriculum/01.physics-chemistry-biology/03.niv3/02.geometrical-optics/02.geometrical-optics-foundings/05.fermat-application/07.fermat-application-level-up/portal.fr.md files