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/image-reference.js

@@ -0,0 +1,63 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {ImageReference, Parents} from 'mdast'
+ */
+
+imageReference.peek = imageReferencePeek
+
+/**
+ * @param {ImageReference} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function imageReference(node, _, state, info) {
+  const type = node.referenceType
+  const exit = state.enter('imageReference')
+  let subexit = state.enter('label')
+  const tracker = state.createTracker(info)
+  let value = tracker.move('![')
+  const alt = state.safe(node.alt, {
+    before: value,
+    after: ']',
+    ...tracker.current()
+  })
+  value += tracker.move(alt + '][')
+
+  subexit()
+  // Hide the fact that we’re in phrasing, because escapes don’t work.
+  const stack = state.stack
+  state.stack = []
+  subexit = state.enter('reference')
+  // Note: for proper tracking, we should reset the output positions when we end
+  // up making a `shortcut` reference, because then there is no brace output.
+  // Practically, in that case, there is no content, so it doesn’t matter that
+  // we’ve tracked one too many characters.
+  const reference = state.safe(state.associationId(node), {
+    before: value,
+    after: ']',
+    ...tracker.current()
+  })
+  subexit()
+  state.stack = stack
+  exit()
+
+  if (type === 'full' || !alt || alt !== reference) {
+    value += tracker.move(reference + ']')
+  } else if (type === 'shortcut') {
+    // Remove the unwanted `[`.
+    value = value.slice(0, -1)
+  } else {
+    value += tracker.move(']')
+  }
+
+  return value
+}
+
+/**
+ * @returns {string}
+ */
+function imageReferencePeek() {
+  return '!'
+}