New architecture of the repository for manual building of the book.

The old architecture was needed for the building of the book by Atlas.
Atlas O'Reilly's building chain (https://atlas.oreilly.com) is broken.

Author: aollier

.gitignore

@@ -9,4 +9,3 @@ progit.pdfmarks
 progit.epub
 progit-kf8.epub
 progit.mobi
-/images/

README.asc

@@ -1,14 +1,6 @@
 namespace :book do
-  desc 'prepare build'
-  task :prebuild do
-    Dir.mkdir 'images' unless Dir.exists? 'images'
-    Dir.glob("book/*/images/*").each do |image|
-      FileUtils.copy(image, "images/" + File.basename(image))
-    end
-  end
-
   desc 'build basic book formats'
-  task :build => :prebuild do
+  task :build do
     puts "Converting to HTML..."
     `bundle exec asciidoctor progit.asc`
     puts " -- HTML output at progit.html"