Add markdown files for documentation

projects.xml and declarative-projects.xml were merged with xmllint, and
then I ran that to convert files
for i in *.xml; do pandoc -s -f docbook -t markdown $i -o ${i/xml/md}; done

doc/manual/Makefile.am

@@ -1,33 +1,6 @@
-DOCBOOK_FILES = installation.xml introduction.xml manual.xml projects.xml hacking.xml
+MD_FILES = src/*.md
 
-EXTRA_DIST = $(DOCBOOK_FILES)
+EXTRA_DIST = $(MD_FILES)
 
-xsltproc_opts =					\
- --param callout.graphics.extension \'.gif\'	\
- --param section.autolabel 1 			\
- --param section.label.includes.component.label 1
-
-
-# Include the manual in the tarball.
-dist_html_DATA = manual.html
-
-# Embed Docbook's callout images in the distribution.
-EXTRA_DIST += images
-
-manual.html: $(DOCBOOK_FILES)
-	$(XSLTPROC) $(xsltproc_opts) --nonet --xinclude		\
-	  --output manual.html					\
-	  $(docbookxsl)/xhtml/docbook.xsl manual.xml
-
-images:
-	$(MKDIR_P) images/callouts
-	cp $(docbookxsl)/images/callouts/*.gif images/callouts
-	chmod +wx images images/callouts
-
-install-data-hook: images
-	$(INSTALL) -d $(DESTDIR)$(htmldir)/images/callouts
-	$(INSTALL_DATA) images/callouts/* $(DESTDIR)$(htmldir)/images/callouts
-	ln -sfn manual.html $(DESTDIR)$(htmldir)/index.html
-
-distclean-hook:
-	-rm -rf images
+install: $(MD_FILES)
+	mdbook build . -d $(docdir)