changed it to proof of share.
Made a small start on populating the horizontal navbar
discovered that no end of my documentation has been broken
by events and should not be linked in.
and a banner.
Broke all my existing markdown builds, because I
have a hundred files that do not fit the new machinery
And now I have to provide navbars for each directory,
and update the mkdocs.sh in each directory
And add a recursive invocation of mkdocs in subdirectories