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/mdast-util-to-markdown/lib/handle/root.js

@@ -0,0 +1,23 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {Parents, Root} from 'mdast'
+ */
+
+import {phrasing} from 'mdast-util-phrasing'
+
+/**
+ * @param {Root} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function root(node, _, state, info) {
+  // Note: `html` nodes are ambiguous.
+  const hasPhrasing = node.children.some(function (d) {
+    return phrasing(d)
+  })
+
+  const container = hasPhrasing ? state.containerPhrasing : state.containerFlow
+  return container.call(state, node, info)
+}