Add job postings section with vacancies listing and footer links

- New /ledigestilling/ index listing all open positions (split
  barber/beauty card styling)
- Three ads: negletekniker + massør (beauty design), barber (gold
  barber design with recolored CSS + assets)
- Rename ledigestilling.html -> negletekniker.html with 301 redirect
- "Ledige stillinger" footer link on barber/beauty pages (NO/EN/HU)
- Back-to-list link on each ad page

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/css/style.css

@@ -623,3 +623,15 @@
 .prices-category{
     margin-bottom:0px;
 }
+
+/* Footer: open positions button */
+.footer-vacancies {
+    display: inline-block;
+    margin-top: 0.75em;
+    color: #fff !important;
+    font-weight: bold;
+    text-decoration: underline;
+}
+.footer-vacancies:hover {
+    text-decoration: none;
+}