feat(ci): nested domains should have same username

- Prettier
- Delete some nested subdomains with different owners
- Fix some domains
- Lowercase all CNAME, MX, NS records for formatting purposes

domains/deadcode.json

@@ -2,10 +2,10 @@
   "owner": {
     "username": "RichardKanshen",
     "email": "richard@kanshen.click",
-    "twitter": "@kanskje0",
+    "twitter": "kanskje0",
     "discord": "kanshen.uwu",
     "bluesky": "kanshen.click",
-    "telegram": "@richardkanskje"
+    "telegram": "richardkanskje"
   },
   "record": {
     "CNAME": "deadcodegames.github.io"