renamed books folder to book folder

wiki/e-book.md

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+# E-books
+
+E-books are digital publications of books.
+They can be read with specific hardware - an e-reader - or on a personal
+computer.
+E-books are usually available in `.epub` or `.pdf` files.
+Amazon (`.azw`), Mobi (`.mobi`) and other brands selling e-readers have
+proprietary formats.
+
+## Management
+
+The management of e-books can be achieved by using special software suites like
+[calibre](/wiki/calibre.md).
+
+## DRM
+
+Proprietary formats may but don't have to feature DRM.
+There are some software solutions for handling DRM like the no longer supported
+[DeDRM by apprenticeharper](https://github.com/apprenticeharper/DeDRM_tools) or
+its supported counterpart [DeDRM by noDRM](https://github.com/noDRM/DeDRM_tools).
+Due to legal issues in many places it is recommended to not use these or
+similar software.
+If the software is to be used by you check your local laws first.
+
+## Tracking
+
+Many e-book readers include a feature to keep track of read books.
+However they do not track the time that was needed to finish them or the number of e-books read in 
+a specific timeframe.
+This can be done by using a special tracker like [Jelu](/wiki/jelu.md) which can be used to keep
+track of e-books and normal books at the same time which is a feature no e-book reader has.