README: flesh out a bit more

README.md

@@ -1,4 +1,34 @@
-# beyond
+# Beyond
 
-**[Cassidy]((https://cassidyjames.com))’s playground for GNOME experiments**, built with [Universal Blue](https://universal-blue.org) and [Fedora Atomic Desktops](https://fedoraproject.org/atomic-desktops/)
+**[Cassidy]’s playground for [GNOME] design experiments**
 
+## What is Beyond?
+
+Beyond is a custom configuration of [Fedora Silverblue] built with [Universal Blue], used as a playground for GNOME design experiments.
+
+The goal is to provide an experience close to stock GNOME (as of the version shipped in the latest stable release of Fedora, e.g. GNOME 46 as of Fedora 40) with minor changes to the experience (e.g. experimental extensions or changed default settings) to test their feasibility and how they feel on real hardware.
+
+### Changes from stock GNOME
+
+Currently, the following changes are being tested in Beyond:
+
+- Inter-based GNOME UI font as the default font
+- Ptyxis (branded as "Terminal") as the default terminal emulator
+- Light Style extension to test the new built-in Shell light style
+- Auto Activities extension to make the overview more discoverable
+
+### Changes from Silverblue
+
+Beyond removes Fedora packages from the OSTree that are unneeded or replaced by other packages/Flatpaks. For example, Fedora-installed GNOME extensions are removed, as are Fedora-specific apps and Flatpak configurations. A non-exhaustive list of these changes includes:
+
+- Firefox package removed (in favor of GNOME Web as a Flatpak) 
+- GNOME Terminal removed (in favor of Ptyxis as a Fedora package)
+- GNOME classic session (and associated GNOME Shell extensions) removed
+
+See [build.sh](./build.sh) for the full set of technical customizations made.
+
+
+[Cassidy]: https://cassidyjames.com
+[GNOME]: https://gnome.org
+[Fedora Silverblue]: https://fedoraproject.org/atomic-desktops/silverblue/
+[Universal Blue]: https://universal-blue.org