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/prismjs/components/prism-yang.js

@@ -0,0 +1,20 @@
+Prism.languages.yang = {
+	// https://tools.ietf.org/html/rfc6020#page-34
+	// http://www.yang-central.org/twiki/bin/view/Main/YangExamples
+	'comment': /\/\*[\s\S]*?\*\/|\/\/.*/,
+	'string': {
+		pattern: /"(?:[^\\"]|\\.)*"|'[^']*'/,
+		greedy: true
+	},
+	'keyword': {
+		pattern: /(^|[{};\r\n][ \t]*)[a-z_][\w.-]*/i,
+		lookbehind: true
+	},
+	'namespace': {
+		pattern: /(\s)[a-z_][\w.-]*(?=:)/i,
+		lookbehind: true
+	},
+	'boolean': /\b(?:false|true)\b/,
+	'operator': /\+/,
+	'punctuation': /[{};:]/
+};