Revert "Actually use the XML catalog from org/xmlresolver/catalog.xml"

This reverts commit d200c5d276948933cc31e678c71e7c2d3b4bd135.
diff --git a/lib/dtds/xhtml11/VERSION b/lib/dtds/xhtml11/VERSION
new file mode 100644
index 0000000..9459d4b
--- /dev/null
+++ b/lib/dtds/xhtml11/VERSION
@@ -0,0 +1 @@
+1.1