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

users/flokli/nixos/.envrc

@@ -1,3 +0,0 @@
-source_up
-
-PATH_add $(nix-build ../../.. -A users.flokli.nixos.deps --no-out-link)/bin

users/flokli/nixos/default.nix

@@ -1,8 +1,6 @@
 { depot, pkgs, lib, ... }:
 
 let
-  systemFor = sys: (depot.ops.nixos.nixosFor sys).system;
-
   # assumes `name` is configured appropriately in your .ssh/config
   deployScript = name: sys: pkgs.writeShellScriptBin "deploy-${name}" ''
     set -eo pipefail

users/flokli/nixos/profiles/archeology.nix

@@ -1,11 +1,8 @@
 # Set of unconditional config options applicable to all archeology machines.
 
-{ depot, pkgs, ... }:
+{ pkgs, ... }:
 
 {
-  # Use the TVL binary cache
-  tvl.cache.enable = true;
-
   # Start clickhose as a system service.
   services.clickhouse.enable = true;