Cleanup old CI directory, add notes

Cleanup old CI directory, add notes

The changes made to move the CI/CD related files from a common
ci directory at the top level eliminate the need for that ci
directory at the repo root.  The files in the directory have been
removed (subsequent clones should not create the directory).

Additionally, a NOTES file has been added at the repo root
for miscellaneous notes. Currently some information about
the CI files maintained in the subdirectories is all it
contains.

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: I3c72972fa5bd0876512f22ff07aa324366c7d2e7