fix: Final restoration with port 80

✅ COMPLETED:
1. Dockerfile uses port 80 (astro preview)
2. BaseLayout imports globals.css
3. globals.css with Tailwind v4 @theme syntax
4. index.astro has Header, Footer, FixedContact
5. All image references fixed to existing files
6. Hero uses hdpe_pipe_main.jpg
7. Product cards use hdpe001.jpg
8. pt-20 on main for fixed header

✅ TESTED LOCALLY:
- Build: 15 pages in 1.27s
- Docker build successful
- Port 80 working
- Images load
- CSS works

Ready for Easypanel deployment.

node_modules/promise-limit/example/example.ts

@@ -0,0 +1,22 @@
+import * as promiseLimit from '../'
+
+const limit = promiseLimit<string>(2)
+var jobs = ['a', 'b', 'c', 'd', 'e']
+
+Promise.all(jobs.map((name) => {
+  return limit(() => job(name))
+})).then(results => {
+  console.log('\nresults:', results)
+})
+
+function job (name): Promise<string> {
+  var text = `job ${name}`
+  console.log('started', text)
+
+  return new Promise(function (resolve) {
+    setTimeout(() => {
+      console.log('       ', text, 'finished')
+      resolve(text)
+    }, 100)
+  })
+}