update webawesome simulation to be closer to the app. (#1789)

* update webawesome simulation to be closer to the app.

* prettier

packages/webawesome/docs/_utils/simulate-webawesome-app.js

@@ -1,10 +1,20 @@
+import * as path from 'node:path';
 import nunjucks from 'nunjucks';
 
+const baseDir = process.env.BASE_DIR || 'docs';
+
+const views = [path.join(baseDir), path.join(baseDir, '_layouts'), path.join(baseDir, '_includes')];
+
+const nunjucksEnv = new nunjucks.Environment(new nunjucks.FileSystemLoader(views), {
+  autoescape: true,
+  noCache: process.env.NODE_ENV === 'development' || process.env.NODE_ENV === 'test',
+});
+
 /**
  * This function simulates what a server would do running "on top" of eleventy.
  */
 export function SimulateWebAwesomeApp(str) {
-  return nunjucks.renderString(str, {
+  return nunjucksEnv.renderString(str, {
     // Stub the server EJS shortcodes.
     currentUser: {
       hasPro: false,