Add documentation to sponsor logos directory.

Which file extensions are used and how to sort on the welcome page.
Make the root tomcat application redirect to fll-sw

This allows one to visit http://localhost:9080 and get redirected to
http://localhost:9080/fll-sw

Fixes #320
Reorganize some pages

To try and make things easier I moved some of the links on pages around
to put the more commonly used links to the top. I could really use a
full reorganization of the links, but I just can't think clearly enough
now to do it.
Merge branch 'task.320.redirect-root'
Merge branch 'new-page-organization'