checkpoint add initial inc/md2html.cfg file

Adjust HTML phase names and filenames under inc.

Improve phase documentation in inc/README.md.

Added inc/md2html.cfg as an initial markdown to HTML configuration
file.  The inc/md2html.cfg file is undergoing design evaluation and
thus may change.  Nevertheless the comments in inc/md2html.cfg give
some hints as to how HTML files will be formed from markdown files.

inc/end-rightcolumn.default.html

@@ -0,0 +1,5 @@
+<!-- START: this line start content from: /inc/end-rightcolumn.default.html -->
+
+  </div>
+
+<!-- END: this line ends content from: /inc/end-rightcolumn.default.html -->