feat: Update arch.json (arch.is-a.dev subdomain)

- Added Email I use occasionally (should probably use more often.
- Discord username replaced with Discord handle. (Arch1010#4338 -> arch1010)
- Added a more descriptive definition.
[Did not change CNAME, repo, and discordid]

domains/arch.json

@@ -1,10 +1,10 @@
 {
-    "description": "My personal website by on arch.is-a.dev",
+    "description": "My personal website on arch.is-a.dev (main files in repo/repository).",
     "repo": "https://github.com/Arch881010/Arch881010",
     "owner": {
         "username": "Arch881010",
-        "email": "",
-        "discord": "Arch1010#4338",
+        "email": "c1yd4.arch@inbox.testmail.app",
+        "discord": "arch1010",
         "discordid": "410248634593050627"
     },
     "record": {