The theme was designed for Liferay 6.0 and was following its look.
Liferay 6.0 is no longer officially supported by Vaadin 8.
Change-Id: I79e8ecd6674b1dce2424121d4c298b69d3f932d4
Fixed critically broken comment blocks, broken emphasis and escaping, and some other formatting, and moved book preface, chapter structure, and index to the docs repository.