Remove remaining old-html content

Remove remaining old-html content

Replace the HTML table hack + static images that created the flow chart
with a graphviz graph.  The presentation could potentially be improved,
but the essential content from the old chart is there (in case it is
useful).

Remove all build system references to old-html, simplifying the system
and removing the need to document any of this.

Change-Id: Ic011c770676d4d6d1b560fcb521bfc523c142ad0