Polishing TIC: Courseware Icons

public/assets/images/icons/yellow/file-copy.svg

public/assets/images/icons/yellow/import.svg

public/assets/images/icons/yellow/info-list.svg

public/assets/images/icons/yellow/list.svg

public/assets/images/icons/yellow/literature-request.svg

public/assets/images/icons/yellow/literature-request2.svg

public/assets/images/icons/yellow/network2.svg

public/assets/images/icons/yellow/progress.svg

public/assets/images/icons/yellow/share.svg

public/assets/images/icons/yellow/source.svg

public/assets/images/icons/yellow/style.svg

resources/assets/stylesheets/scss/courseware.scss

...es/vue/components/courseware/CoursewareShelfDialogAdd.vue

...s/vue/components/courseware/CoursewareShelfDialogCopy.vue

...ents/courseware/CoursewareStructuralElementDialogCopy.vue

resources/vue/components/courseware/CoursewareUnitItem.vue