Make HTML template a bit more generic

doc/gfdoc/Makefile

@@ -2,14 +2,16 @@ TMP=tmp.html
 TEMPLATE=../synopsis/template.html
 ROOT=../..
 
+TITLE=$(shell head -n 1 sources.txt)
 sources.html: sources.txt $(TEMPLATE)
-	txt2tags --target=html --no-headers --quiet --toc --outfile=$@ --infile=$<
+	txt2tags --target=html --no-headers --quiet --outfile=$@ --infile=$<
 	pandoc \
 		--from=html \
 		--to=html5 \
 		--standalone \
 		--template=$(TEMPLATE) \
-		--metadata='title:"More modules in the GF Resource Grammar Library"' \
+		--metadata='title:"$(TITLE)"' \
+		--variable='lang:en' \
 		--variable='rel-root:$(ROOT)/..' \
 		--output=$(TMP) \
 		$@