feat: dinit or die

why the FUCK did i think making an init selector was a good idea
artix themselves dont even ship services in their online installer
they just give you a bare system and say "figure it out" and
it WORKS because people can just install their init of choice
afterwards. but nooooo i had to be clever and build a whole
netinstall-add monstrosity with openrc/runit/s6 service groups
that broke constantly because basestrap --overwrite is a lie
and init packages conflict with each other and sddm-openrc +
lightdm-openrc both Provide: init-displaymanager and pacman
just goes 🖕 during install.

so anyway. dinit only now. you want something else? read
changing-init.md, i literally copied the artix wiki tutorial.
i am not maintaining four init service groups in netinstall.yaml
for the rest of my life. this is my villain origin story.

actual changes:
- ripped out offline calamares mode (was never truly offline)
- ripped out packagechooser.conf (good fucking riddance)
- added packagechooser_dm.conf so you can at least pick your DM
- added BYODE offline installer (bare system + btrfs + snapper,
  no DE, you pacman -Sy plasma-meta yourself)
- added yay + snapper + btrfs-progs to rootfs
- shoved Init Services + DM groups into netinstall.yaml (dinit
  only, obviously)
- updated every markdown file that mentioned another init like
  they were cursed (they were)
- wrote changing-init.md so i can just paste the link next time
  someone asks
- X-KDE-IsAdminApplication=true so KDE stops acting like
  calamares is a virus (its not, its just desperate)

iso-profiles/antergos/live-overlay/etc/calamares-online/modules/netinstall.yaml

@@ -144,3 +144,60 @@
       selected: false
       packages:
         - cosmic
+
+- name: "Init Services"
+  description: "Essential dinit services"
+  selected: true
+  critical: true
+  immutable: true
+  packages:
+    - dinit
+    - dbus-dinit
+    - networkmanager-dinit
+    - elogind-dinit
+    - cups-dinit
+    - avahi-dinit
+    - bluez-dinit
+    - cronie-dinit
+    - openssh-dinit
+    - alsa-utils-dinit
+    - acpid-dinit
+    - dhcpcd-dinit
+    - syslog-ng-dinit
+    - power-profiles-daemon-dinit
+
+- name: "SDDM"
+  description: "SDDM display manager"
+  selected: false
+  packages:
+    - sddm
+    - sddm-dinit
+    - antergos-sddm-theme
+
+- name: "LightDM"
+  description: "LightDM display manager"
+  selected: false
+  packages:
+    - lightdm
+    - lightdm-dinit
+
+- name: "LXDM"
+  description: "LXDM display manager"
+  selected: false
+  packages:
+    - lxdm
+    - lxdm-dinit
+
+- name: "greetd"
+  description: "greetd display manager"
+  selected: false
+  packages:
+    - greetd
+    - greetd-dinit
+
+- name: "LY"
+  description: "LY display manager"
+  selected: false
+  packages:
+    - ly
+    - ly-dinit