ref(inventory): Split up inventory into group vars

One inventory targets a local machine (`inv-local.yaml`, chosen by default)
while the other targets a chrooted installation accessible from another
system, usually in the `/mnt/void` directory (`inv-chroot.yaml`, has to
be called like `ansible-playbook -i inv-chroot.yaml`).

group_vars/desktop.yaml

@@ -0,0 +1,19 @@
+fonts:
+  - nerd-fonts-otf
+  - noto-fonts-ttf
+  - noto-fonts-cjk
+  - noto-fonts-emoji
+packages_de:
+  - bemenu
+  - pinentry-bemenu
+  - clipman
+  - grim
+  - kanshi
+  - mako
+  - slurp
+  - waylock
+packages_gui:
+  - gimp
+  - qutebrowser
+  - sioyek
+  - wdisplays