replace typography extends by mixins

assets/sass/_theme/blocks/base.sass

assets/sass/_theme/blocks/call_to_action.sass

assets/sass/_theme/blocks/chapter.sass

assets/sass/_theme/blocks/files.sass

assets/sass/_theme/blocks/gallery.sass

assets/sass/_theme/blocks/image.sass

assets/sass/_theme/blocks/pages.sass

assets/sass/_theme/blocks/testimonials.sass

assets/sass/_theme/blocks/timeline.sass

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

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

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

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

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

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

assets/sass/_theme/hugo-osuny.sass

assets/sass/_theme/sections/diplomas.sass

assets/sass/_theme/sections/organizations.sass

assets/sass/_theme/sections/pages.sass

assets/sass/_theme/sections/persons.sass