fix: serve quartz with clean URL support and regenerate site

- Add serve.py to resolve clean Quartz URLs to .html files
- Regenerate Quartz site with correct baseUrl http://100.118.5.51:9120
- 196 HTML files emitted; all internal links now resolve

node_modules/underscore/modules/isUndefined.js

@@ -0,0 +1,4 @@
+// Is a given variable undefined?
+export default function isUndefined(obj) {
+  return obj === void 0;
+}