fix: correct "Discalaimer" typo in footer nav (closes #91)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: adamjohnwright

projects/website-angular/src/config/nav-options.json

@@ -49,7 +49,7 @@
         "link": "/about/privacy-notice"
       },
       "disclaimer": {
-        "label": "Discalaimer",
+        "label": "Disclaimer",
         "link": "/about/disclaimer"
       },
       "digital-preservation": {