feat: gtk theme configuration

desktop.yml

@@ -4,3 +4,4 @@
     - desktop
     - sway
     - waybar
+    - themes

roles/themes/tasks/main.yml

@@ -0,0 +1,15 @@
+- name: Install python3-psutil to interact with dconf
+  ansible.builtin.apt:
+    name: python3-psutil
+- name: Set gtk theme
+  community.general.dconf:
+    key: "/org/gnome/desktop/interface/gtk-theme"
+    value: "'Adwaita'"
+- name: Set gtk icon theme
+  community.general.dconf:
+    key: "/org/gnome/desktop/interface/icon-theme"
+    value: "'Adwaita'"
+- name: Enable dark mode
+  community.general.dconf:
+    key: /org/gnome/desktop/interface/color-scheme
+    value: "'prefer-dark'"