Ajout des options au layout "liste" des projets (#914)

assets/sass/_theme/blocks/projects.sass

assets/sass/_theme/design-system/layouts/list.sass

assets/sass/_theme/sections/projects.sass

hugo.yaml

layouts/partials/commons/item/heading.html

...s/projects/partials/layouts/alternate/alternate-item.html

...rtials/projects/partials/layouts/alternate/alternate.html

...ts/partials/projects/partials/layouts/grid/grid-item.html

layouts/partials/projects/partials/layouts/grid/grid.html

.../partials/projects/partials/layouts/large/large-item.html

layouts/partials/projects/partials/layouts/large/large.html

...ts/partials/projects/partials/layouts/list/list-item.html

layouts/partials/projects/partials/layouts/list/list.html

layouts/partials/projects/partials/project.html

layouts/partials/projects/partials/project/categories.html

layouts/partials/projects/partials/project/heading.html

layouts/partials/projects/partials/project/media.html

layouts/partials/projects/partials/project/summary.html

layouts/partials/projects/partials/project/year.html

layouts/partials/projects/partials/projects.html