Add supporting themes required for Lotusdocs

themes/hugo-mod-jslibs-dist/popperjs/package/dist/esm/utils/rectToClientRect.js

@@ -0,0 +1,8 @@
+export default function rectToClientRect(rect) {
+  return Object.assign({}, rect, {
+    left: rect.x,
+    top: rect.y,
+    right: rect.x + rect.width,
+    bottom: rect.y + rect.height
+  });
+}