add missing author/index.html

We changed `author/README.md` to refer to FAQs instead
of trying to duplicate FAQ information.

Added `author/README.md` to `bin/md2html.cfg`.

Changed `bin/gen-top-html.sh` VERSION from "1.4.8 2024-08-05"
to "1.4.9 2024-08-11".

Performed `make gen_top_html` to accomplish the above and to test under macOS.

bin/md2html.cfg

@@ -115,6 +115,22 @@ archive/historic/README.md
 	-D
 	../../
 
+author/README.md
+	-H
+	navbar=empty
+	-o
+	bin/subst.default.sh
+	-s
+	TITLE=The International Obfuscated C Code Contest
+	-s
+	DESCRIPTION=Winning IOCCC Author Information
+	-s
+	KEYWORDS=IOCCC, author_handle, author handle, winning author
+	-s
+	HEADER_2=Winning author information directory
+	-D
+	../
+
 authors.md
 	-H
 	navbar=empty