Add Dune as easy (#2841)

* Add Dune account deletion instructions to sites.json

* Update domain for Dune site entry

Fix domains

* Fix domain format for Dune entry in sites.json

---------

Co-authored-by: Tulio Leao <tupaschoal@gmail.com>

Author: GuardianLiarus

_data/sites.json

@@ -5820,6 +5820,13 @@
         "email_body": "Hereby the request to delete my account associated with my email.",
         "domains": ["duetnightabyss.dna-panstudio.com"]
     },
+    {
+        "name": "Dune",
+        "url": "https://dune.com/settings/account",
+        "difficulty": "easy",
+        "notes": "Click Delete account and type ‘DELETE’ to confirm",
+        "domains": ["dune.com"]
+    },
     {
         "name": "Dunkindonuts",
         "url": "https://www.dunkindonuts.com/en/about/contact-us",