Ajout des catégories aux blocs de pages (#905)

assets/sass/_theme/blocks/pages.sass

assets/sass/_theme/sections/pages.sass

hugo.yaml

layouts/partials/blocks/templates/pages/alternate.html

layouts/partials/blocks/templates/pages/cards.html

layouts/partials/blocks/templates/pages/grid.html

layouts/partials/blocks/templates/pages/large.html

layouts/partials/blocks/templates/pages/list.html

layouts/partials/pages/page.html