JBPM-4154: Move FormModeller documentation to KIE docs
JBPM-4155: Move DataModeller documentation to KIE docs
Removing target folder
adding .gitignore`s in order to avoid push target folder
BZ:1022861 - Suggested improvement to layout/alignment settins in form modeler

(cherry picked from commit 2856655d4a904213de88ee767a8d3375ff412abd)