Add configuration for Vercel domain verification

domains/_vercel.www.sahnoun.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "YOUR_GITHUB_USERNAME",
+    "email": "YOUR_EMAIL"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=www.sahnoun.is-a.dev,47014c9e7b48f27cced5"
+  }
+}