doc-vtk: move sources out of build/

Makefile

@@ -72,7 +72,11 @@ install:
 %/pinephone_phone.vtk: cq_toplevel.py src/*.py
 	./cq_toplevel.py --render-phone-only --export-vtk $@
 
-doc: build/doc-vtk/pinephone_case.vtk build/doc-vtk/pinephone_phone.vtk
+build/doc-vtk/vtk.js: doc.in/vtk.js
+	ln -sf ../../doc.in/vtk.js $@
+build/doc-vtk/index.html: doc.in/index.html build/doc-vtk/vtk.js build/doc-vtk/pinephone_case.vtk build/doc-vtk/pinephone_phone.vtk
+	ln -sf ../../doc.in/index.html $@
+doc: build/doc-vtk/index.html
 
 clean:
 	rm -rf build