readme: Add screenshots

README.md

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 # zero
 
-My personal repository for storing and sharing my manifests and declarative configuration files for my GNU Guix operating system and home environment.
+My personal repository for storing and sharing my **manifests** and **declarative configuration files** for my **GNU Guix** operating systems and home environments.
+
+![radio's home environment](home-environments/radio/screenshots/awesome-1.png)
+![radio's home environment](home-environments/radio/screenshots/awesome-2.png)
+
+## Configuration files
+**zero** stands as a centralized repository for diverse **configuration files**, spanning both my personal **home** and **system** declarative configurations. It also hosts various manifests and settings for a variety of applications.
+
+### Home environments
+- radio
+    * **Applications**
+    - awesome
+    - dash
+    - emacs
+    - fish
+    - info
+    - git
+    - keepassxc
+    - kakoune
+    - lf
+    - mpv
+    - pipewire
+    - sioyek
+    - xst
+    * **Manifests**
+    - clojure
+    - emacs
+    - guile
+    - idris
+    - tex
+    - theorem-proving
+
+### Operating systems
+- buer
+    * **Applications**
+    - dhcp
+    - doas
+    - mcron
+    - thermald
+    - thinkfan
+    - tlp
+    - udev
+    - wpa-supplicant