Move coursebook to different directory

...pps/alsijil/frontend/components/coursebook/Coursebook.vue

...frontend/components/coursebook/CoursebookEmptyMessage.vue

...sijil/frontend/components/coursebook/CoursebookLoader.vue

...alsijil/frontend/components/coursebook/coursebook.graphql

...end/components/coursebook/documentation/Documentation.vue

...mponents/coursebook/documentation/DocumentationLoader.vue

...omponents/coursebook/documentation/DocumentationModal.vue

...components/coursebook/documentation/LessonInformation.vue

...ntend/components/coursebook/documentation/LessonNotes.vue

...end/components/coursebook/documentation/LessonSummary.vue

aleksis/apps/alsijil/frontend/index.js