XML: move file to "Headless" subdirectory
XML: Rearrange articles

Remove "Gordian knot"
Remove "Remarks on enlightenment"
Move "Useful tool" to end of list
Alarm text: Increase margin for alarm help text

More space between the edges to enhance clarity.
Reflections: Change reflection help text

Make shorter and more succinct.
XML Parser: Add APIs for both files and URLs

This will help with testing. I can test with files in the bundle as well
as with XML files on the server. This will also reduce redundant files.
XML: Update labels and titles

Change "Video" cell text to "Videos"
Change "Reflections" cell text to "Video Reflections"
Remove "Reflections" group title from submenu
XML: change local url base to "headless-app"
XML: Updated with new experiment HTML pages
XML: Add new articles HTML pages
XML: renamed to data.xml
XML: use new "welcome.htm" file
XML: change links from localhost to headless.org
Root View: Use xml file from headless.org