HTML manual: change the naming of Hevea-generated image files

doc/Makefile

@@ -16,13 +16,22 @@ all: main.pdf main.html
 
 main.html: main.tex $(DEPS) $(wildcard *.hva)
 	hevea -fix main.tex
-	@# Hevea interprets 'tabbing' environment in a way
-	@# that creates spacing errors in the rendered output
-	@# of "textual version of derivation trees": it
-	@# asks for (padding:0px;) while the TeX rendering
-	@# inserts spacing between columns. Change this
-	@# to {padding:1px;}
+#
+# Hevea interprets 'tabbing' environment in a way
+# that creates spacing errors in the rendered output
+# of "textual version of derivation trees": it
+# asks for (padding:0px;) while the TeX rendering
+# inserts spacing between columns. Change this
+# to {padding:1px;}
 	$(SED) -i -e "s/cellpadding0/cellpadding1/" main.html
+#
+# Hevea generates images main00{1,2,3}.png for the tikz pictures
+# present in the manual. Rename them into manual-figure00{1,2,3}.png
+# for consistency with the naming scheme of the deployed manual files.
+	for f in 1 2 3; do \
+	  mv main00$$f.png manual-figure00$$f.png; \
+	done
+	$(SED) --in-place 's/<img src="main/<img src="manual-figure/g' main.html
 
 loop:
 	latexmk -pdf -pvc main