Update 01.curriculum/01.physics-chemistry-biology/04.niv4/frontmatter.yaml, 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.en.md, 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.es.md, 01.curriculum/01.physics-chemistry-biology/04.niv4/topic.fr.md files
Deleted 04.niv4/frontmatter.yaml, 04.niv4/topic.en.md, 04.niv4/topic.es.md, 04.niv4/topic.fr.md files