make bake working as first level summary
update css for the menu
remove duplicated content
update code-generation link
add bake to pdf and epub generation
fix build warning
Some tweaks to the bake documentation.
Wrap long lines.
move bake in the summary
[fr] follow bake 3.0 #2095
polish fr translation
Merge pull request #2095 from cakephp/3.0-bake

3.0 bake