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
Merge pull request #2096 from dakota/3.0

Add note about schema shell being removed
breaks out Building Associations from table-objects.rst into own article
Merge pull request #2097 from Schlaefer/feature/3.0-assocBranch

3.0 - breaks out Building Associations from table-objects.rst into seperate article
[fr] follow #2091, #2094 and #2096
[fr] follow #2097
polish fr translation
Merge pull request #2095 from cakephp/3.0-bake

3.0 bake
Add example of IS NOT NULL generation
Add missing ---'s
Merge pull request #2100 from dakota/3.0-is-not-null

Add example of IS NOT NULL generation