chore: remove unused styles

...ucture-detail-print/structure-detail-print.component.scss

src/app/shared/components/tag-item/tag-item.component.scss

.../training-type-picker/training-type-picker.component.scss

src/app/structure-list/components/card/card.component.scss

...onents/structure-details/structure-details.component.scss

src/app/structure-list/structure-list.component.scss

src/assets/scss/_buttons.scss

src/assets/scss/_color.scss

src/assets/scss/_ghost.scss

src/assets/scss/_hyperlink.scss

src/assets/scss/_inputs.scss

src/assets/scss/_shapes.scss

src/styles.scss