Remove out of date documentation

The HTML docs have not been updated in 10+ years. The README and man
pages should suffice for now.

doc/Makefile.am

@@ -9,29 +9,11 @@ if ENABLE_MAN
 	mdb-array.1 mdb-header.1 mdb-hexdump.1 mdb-parsecsv.1 mdb-prop.1 mdb-import.1 \
 	mdb-count.1 mdb-json.1 mdb-queries.1
 endif
-if ENABLE_DOCBOOK
-  dist_man_MANS += install.tgz
-endif
-CLEANFILES = ${dist_man_MANS} install install.tgz
+CLEANFILES = ${dist_man_MANS}
 EXTRA_DIST	= mdb-tables.txt mdb-ver.txt mdb-export.txt mdb-schema.txt mdb-sql.txt \
 	mdb-array.txt mdb-header.txt mdb-hexdump.txt mdb-parsecsv.txt mdb-prop.txt mdb-import.txt \
 	mdb-count.txt mdb-json.txt mdb-queries.txt \
-        faq.html install.sgml txt2man
+        txt2man
 
 .txt.1:
 	$(TXT2MAN) -t $* -r "$(PRODUCT) $(VERSION)" -s 1 -v "Executable programs or shell commands" $(srcdir)/$< > $@
-
-# Converting DocBook to HTML (several small files)
-# http://www.freebsd.org/tutorials/docproj-primer/x3132.html#AEN3140
-install.tgz: $(srcdir)/install.sgml
-	rm -rf html
-	mkdir html
-	cd html && \
-	    openjade -d ${DOCBOOK_DSL} -t sgml ../install.sgml
-	[ -f html/book1.htm ]
-	ln -s book1.htm html/index.html
-	[ -L install ] || ln -s html install
-	tar zcf install.tgz install/*
-
-clean-local:
-	-rm -rf html