feat: finish nix-update, add idle/github/bright.

pkgs/default.nix

@@ -15,4 +15,5 @@ in
   opacitytoggle = callPackage ./opacitytoggle { };
   fs-diff = callPackage ./fs-diff { };
   update-checker = callPackage ./update-checker { };
+  github-notifications = callPackage ./github-notifications { };
 }

pkgs/github-notifications/default.nix

@@ -0,0 +1,13 @@
+{ writeShellApplication, jq }:
+
+writeShellApplication {
+  name = "github-notifications";
+  runtimeInputs = [ jq ];
+  text = ''
+    count=$(curl -u Swarsel:"$(cat /run/user/1000/secrets/github_notif)" https://api.github.com/notifications | jq '. | length')
+
+    if [[ "$count" != "0" ]]; then
+        echo "{\"text\":\"$count\"}"
+    fi
+  '';
+}