implement a multi-file template interpreter

examples/react-app-generator/templates/react-router.tmpl

@@ -0,0 +1,19 @@
+import React from 'react';
+import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';
+{{range .AST.Definitions}}{{if .Page}}import {{.Page.Name}}Page from './pages/{{if eq .Page.Layout "admin"}}admin/{{end}}{{.Page.Name}}';
+{{end}}{{end}}
+
+export default function AppRouter() {
+  return (
+    <Router>
+      <Routes>
+        {{range .AST.Definitions}}{{if .Page}}
+        <Route
+          path="{{.Page.Path}}"
+          element={<{{.Page.Name}}Page />}
+        />
+        {{end}}{{end}}
+      </Routes>
+    </Router>
+  );
+}