cv: add hrule after section headings

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

flake.lock

@@ -2,16 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1666393929,
-        "narHash": "sha256-Tet6WIaK0NaeNmr+0ayIkHEauuKde+Tv3X+giSQB6wE=",
+        "lastModified": 1691464053,
+        "narHash": "sha256-D21ctOBjr2Y3vOFRXKRoFr6uNBvE8q5jC4RrMxRZXTM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "7a0b1f3b9549507ba45339178221e6494f5ab6d7",
+        "rev": "844ffa82bbe2a2779c86ab3a72ff1b4176cec467",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "release-22.05",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -22,13 +22,31 @@
         "utils": "utils"
       }
     },
-    "utils": {
+    "systems": {
       "locked": {
-        "lastModified": 1659877975,
-        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1689068808,
+        "narHash": "sha256-6ixXo3wt24N/melDWjq70UuHQLxGV8jZvooRanIHXw0=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "rev": "919d646de7be200f3bf08cb76ae1f09402b6f9b4",
         "type": "github"
       },
       "original": {