toc offcanvas wip

assets/js/theme/design-system/toc.js

assets/js/theme/index.js

assets/sass/_theme/_configuration.sass

assets/sass/_theme/_utils.sass

assets/sass/_theme/design-system/grid.sass

assets/sass/_theme/design-system/nav.sass

assets/sass/_theme/design-system/table_of_content.sass

layouts/pages/list.html

layouts/partials/footer/debug.html

layouts/partials/pages/document-nav.html

layouts/partials/pages/toc.html

layouts/partials/toc/container.html

layouts/partials/toc/cta.html