Enable dark theme.

This should hopefully carry over into the browser and such so I don't get blinded.

ansible/roles/sway/tasks/peruser.yaml

@@ -14,6 +14,7 @@
     - ".config/xdg-desktop-portal-wlr"
     - ".config/mako"
     - ".config/wlogout"
+    - .config/gtk-3.0
 
 - name: Copy files
   copy:
@@ -35,6 +36,8 @@
       dest: .config/electron-flags.conf
     - src: mako_config
       dest: .config/mako/config
+    - src: settings.ini
+      dest: .config/gtk-3.0/settings.ini
 
 - name: Configure dotfiles (conf directory)
   copy: