allow site to run locally without PG env vars

site/src/server.js

@@ -14,9 +14,11 @@ const app = polka({
 	}
 });
 
-app.use(
-	authenticate(),
+if (process.env.PGHOST) {
+	app.use(authenticate);
+}
 
+app.use(
 	sirv('static', {
 		dev: process.env.NODE_ENV === 'development',
 		setHeaders(res) {

site/src/utils/db.js

@@ -1,7 +1,7 @@
 import { Pool } from 'pg';
 
 // Uses `PG*` ENV vars
-export const DB = new Pool();
+export const DB = process.env.PGHOST ? new Pool() : null;
 
 export function query(text, values=[]) {
 	return DB.query(text, values).then(r => r.rows);