introduce empty about page
comment out about page url until deployment
add note in regards to about page being commented out
Merge pull request #526 from ascott1/about

introduce empty about page
better appendix markers
Add class to empty appendix headings
Merge pull request #527 from ascott1/appendix-markers

better appendix markers
Merge pull request #528 from cmc333333/header-spacing

Add class to empty appendix headings
adding css for .empty-header class
Merge pull request #530 from jpyuda/master

adding css for .empty-header class