Generate a basic documentation website with the mkdocs toolkit.

No content yet other than man pages.  To make the man pages render
nicely in mkdocs, I removed the static %-headers and put the code for
them into default.md.tmp.do instead.  That way, the raw input redo-*.md
files will look right in mkdocs.

Documentation/redo-ood.md

@@ -1,7 +1,3 @@
-% redo-ood(1) Redo %VERSION%
-% Avery Pennarun <apenwarr@gmail.com>
-% %DATE%
-
 # NAME
 
 redo-ood - print the list of out-of-date redo targets