Update apps pt2 + Add MAYHEM Evil Portal

applications/external/subghz_remote/application.fam

@@ -5,7 +5,7 @@ App(
     entry_point="subghz_remote_app",
     stack_size=2 * 1024,
     order=11,
-    fap_icon="subrem_10px.png",
+    fap_icon="icon.png",
     fap_description="SubGhz Remote, uses up to 5 .sub files",
     fap_category="Sub-GHz",
 )

applications/external/subghz_remote/helpers/txrx/Readme.md

@@ -0,0 +1,4 @@
+This is part of the official `SubGhz` app from [flipperzero-firmware](https://github.com/flipperdevices/flipperzero-firmware/tree/3217f286f03da119398586daf94c0723d28b872a/applications/main/subghz)
+
+With changes from [unleashed-firmware
+](https://github.com/DarkFlippers/unleashed-firmware/tree/3eac6ccd48a3851cf5d63bf7899b387a293e5319/applications/main/subghz)