feat: course section reordering & migration to course v2 (#437)

* feat: reorder sections and lessons gracefully

* convert course into version 2

* feat: get next and prev working

apps/dashboard/src/lib/utils/translations/es.json

@@ -801,14 +801,14 @@
     },
     "navItems": {
       "nav_news_feed": "Noticias",
-      "nav_lessons": "Lecciones",
       "nav_attendance": "Asistencia",
       "nav_submissions": "Envíos",
       "nav_marks": "Marcas",
       "nav_people": "Gente",
       "nav_certificates": "Certificados",
       "nav_landing_page": "Página de destino",
-      "nav_settings": "Ajustes"
+      "nav_settings": "Ajustes",
+      "nav_content": "Contenido"
     },
     "not_permitted": {
       "header": "Sin autorización",