INCUBATOR-234 - use a single file for the cookbook, multiple files are not useful

Author: bdelacretaz

jbake.properties

@@ -16,8 +16,6 @@ template.guide.file=guide.gsp
 template.proposalGuide.file=guide.gsp
 template.pmcGuide.file=guide.gsp
 template.policy.file=policy.gsp
-template.cookbook.file=cookbook.gsp
-template.cookbook_index.file=cookbook_index.gsp
 render.index=false
 index.file=index.html
 content.folder=pages