Update 01.curriculum/01.physics-chemistry-biology/02.niv2/frontmatter.yaml, 01.curriculum/01.physics-chemistry-biology/02.niv2/topic.en.md, 01.curriculum/01.physics-chemistry-biology/02.niv2/topic.es.md, 01.curriculum/01.physics-chemistry-biology/02.niv2/topic.fr.md files
Deleted 02.niv2/frontmatter.yaml, 02.niv2/topic.en.md, 02.niv2/topic.es.md, 02.niv2/topic.fr.md files