Remove Firebase hosting, back to Express

modules/middleware/staticFiles.js

@@ -0,0 +1,12 @@
+import express from 'express';
+
+const staticMiddleware = express.static('public', { maxAge: '1y' });
+
+export default function staticFiles(req, res, next) {
+  if (req.query.meta != null) {
+    // Let ?meta requests fall through.
+    return next();
+  }
+
+  staticMiddleware(req, res, next);
+}