Configure Gnome

- add ~/.config/gnome-settings/*.ini
  => static files with a commented export of Gnome settings
- re-load these configs with `update-machine`

.config/gnome-settings/shell-base.ini

@@ -0,0 +1,27 @@
+[org/gnome/shell]
+# We use the 'AlphabeticalAppGrid@stuarthayhurst'
+# extension to populate "app-picker-layout"
+# See ~/.config/gnome-settings/shell-extensions.ini
+# app-picker-layout=@aa{sv} []
+
+# Always reset the command history
+command-history=@as []
+
+development-tools=false
+favorite-apps=@as []
+
+# Never show Gnome's welcome dialog again
+welcome-dialog-last-shown-version='999.999'
+
+[org/gnome/shell/app-switcher]
+current-workspace-only=true
+
+# [org/gnome/shell/keybindings]
+# See ~/.config/gnome-settings/key-bindings.ini for the key bindings
+
+[org/gnome/shell/window-switcher]
+app-icon-mode='both'
+current-workspace-only=true
+
+[org/gnome/shell/world-clocks]
+locations=@av []