Add simple course book list

As the first step towards the new course book, the main course book page should be created. As the existing mock-up states, this should contain a table of lesson documentations (with a button at the end of the page that triggers new documentations to be loaded and the possibility to implement infinite scrolling at some point in the future; see #270 (closed)), created when some field in a documentation is edited. The basic filter functionality seen in the mock-up should be added. From the start on, the page should be mobile and desktop friendly. Management features for personal notes/absences/lesson documentations, the additional absence overview page and export functionality are to be added later on.