feat: assign custom 404 pages with the website theme (1.8.0)

package.json

@@ -12,7 +12,8 @@
     "test:admin": "node scripts/admin-quality-check.mjs",
     "test:search": "node scripts/live-search-check.mjs",
     "test:image-size": "node scripts/image-size-check.mjs",
-    "test:link-media": "node scripts/link-media-check.mjs"
+    "test:link-media": "node scripts/link-media-check.mjs",
+    "test:404": "node scripts/not-found-check.mjs"
   },
   "devDependencies": {
     "@axe-core/playwright": "^4.10.0",