feat: unified portal server, single database migration & railway configuration

WebGIS_ChloroplethData_ImportGeoJSON_FromArcMap/server.js

@@ -0,0 +1,10 @@
+const express = require('express');
+const path = require('path');
+const app = express();
+
+app.use(express.static(__dirname));
+
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+    console.log(`WebGIS Chloropleth static server running on port ${PORT}`);
+});