symlink haccfiles into /etc/haccfiles

upsides:
 - we will no longer get confused about which state is currently deployed
downsides:
 - deploys get slower, since it has to uploads the entire haccfiles each time

flake.nix

@@ -62,6 +62,7 @@
         modules = [
           ./hosts/parsons/configuration.nix
           { nixpkgs.pkgs = pkgs; }
+          { environment.etc."haccfiles".source = self.outPath; }
         ];
         specialArgs = {
           # with a few exceptions, the flake inputs can be used the same