Add GitHub Desktop Plus icon and description (#100)

* Delete icons/github-desktop.png

* Add github-desktop-plus icon

* Replace GitHub Desktop description with GitHub Desktop Plus

Updated project description and added demo image.

Author: shuvashish76

apps/github-desktop-plus.md

@@ -0,0 +1,10 @@
+# GITHUB-DESKTOP-PLUS
+
+ Electron-based GitHub Desktop fork with advanced functionality and Bitbucket, GitLab integration.
+
+<img src="https://github.com/pol-rivero/github-desktop-plus/blob/main/docs/assets/github-desktop-plus-demo.webp" alt="Demo" style="max-width:1000px;">
+
+ SITE: https://github.com/pol-rivero/github-desktop-plus
+
+ | [Applications](https://portable-linux-apps.github.io/apps.html) | [Home](https://portable-linux-apps.github.io)
+ | --- | --- |