Update speedcrunch (use AppImage only) (#51)

* Add dumb icons

* Update speedcrunch.md

---------

Co-authored-by: Portable-Linux-Apps <noreply@github.com>

Author: ivan-hc

apps/speedcrunch.md

@@ -2,7 +2,11 @@
 
  A high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL.
 
- SITE: https://ryujinx.org
+ This is the unofficial AppImage.
+
+ SITE: http://speedcrunch.org
+
+ APPIMAGE: github.com/repos/pkgforge-dev/SpeedCrunch-AppImage
 
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