Add delta-aegis-icons to the Readme

fix: remove preview

Author: GitGitro

README.md

@@ -125,6 +125,10 @@ documentation](docs/iconpacks.md).
   [<img width=500 alt="aegis-icons preview"
   src="https://raw.githubusercontent.com/aegis-icons/aegis-icons/master/showcase.png">](https://github.com/aegis-icons/aegis-icons)
 
+- [delta-aegis-icons](https://github.com/Delta-Icons/aegis-icons)
+
+  Delta version of the unofficial monochrome-styled 2FA icon pack aegis-icons.
+
 - [aegis-simple-icons](https://github.com/alexbakker/aegis-simple-icons) *
 
   This project periodically generates an icon pack for Aegis based on [Simple