chore(*): drop everything that is not required for Tvix

Co-Authored-By: edef <edef@edef.eu>
Co-Authored-By: Ryan Lahfa <raito@lix.systems>
Change-Id: I9817214c3122e49d694c5e41818622a08d9dfe45

ops/machines/all-systems.nix

@@ -1,28 +1,6 @@
 { depot, ... }:
 
 (with depot.ops.machines; [
-  sanduny
-  bugry
-  nevsky
-]) ++
-
-(with depot.users.tazjin.nixos; [
-  camden
-  frog
-  tverskoy
-  zamalek
-]) ++
-
-(with depot.users.aspen.system.system; [
-  yeren
-  mugwump
-  ogopogo
-  lusca
-]) ++
-
-(with depot.users.wpcarro.nixos; [
-  ava
-  kyoko
-  marcus
-  tarasco
+  meta01
+  public01
 ])