delete empty h1 element
delete unused classes icon-editable and icon-addable
fix code indentation
move class .editable, .markdown-required and .mark-down-required-label to content-editable.less
move pencil icon from contenteditable attribute to editable and editable-content classes
change page-header span to inline-block do pencil icon doesn't fall to next line
add editable-content class to editable elements