[ghex] docs: Remove beta info document and ref thereto

[Logan Rathbone <larathbone src gnome org>]

commit d9654b30fff28195de9bf54d03191fb8de67b464
Author: Logan Rathbone <poprocks gmail com>
Date:   Thu Mar 31 21:21:34 2022 -0400

    docs: Remove beta info document and ref thereto

 BETA-INFO.txt | 70 -----------------------------------------------------------
 README.md     |  8 -------
 2 files changed, 78 deletions(-)
---
diff --git a/README.md b/README.md
index 3e8d482..fe69d66 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,6 @@ other. GHex is a useful tool for working with raw data.
 GHex is part of the GNOME Extra Apps family of applications and is not a core
 GNOME application.
 
-## Note re: Beta State of GHex 4
-
-The `master` branch now contains GHex 4, which is presently in beta state.
-However, testing is welcome. It may be most easily installed for most users via
-Flatpak, using the `gnome-nightly` repository.
-
-For more information, please see [this document](/BETA-INFO.txt).
-
 ## System Requirements
 
 Please see the meson.build file for details.