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>

ledigestilling/assets/css/main.css

@@ -4167,4 +4167,14 @@ input, select, textarea {
 					width: 5px;
 				}
 
-	}
+	}
+/* back link to vacancies index */
+.back-to-list {
+    display: inline-block;
+    margin-bottom: 1.5em;
+    color: #a5705b !important;
+    font-weight: bold;
+    text-decoration: none;
+    border-bottom: none !important;
+}
+.back-to-list:hover { text-decoration: underline; }