Stop deleting cache files after 2 weeks

This was nice, but some programs (nix, and roc for example) don't play
nicely when a portion of their cache goes missing.

Instead of adding an exclusion for each of these programs, I'm just
not going to peridoically delete cache.

lutea/config.nix

···
     };
 
   systemd.tmpfiles.settings."home-files" = {
-    "/home/mou/.cache".d = {
-      user = "mou";
-      group = "mou";
-      age = "14d";
-    };
-    "/home/mou/.cache/nix/gitv3/*".x = { };
-    "/home/mou/.cache/nix/tarball-cache/.git/*".x = { };
     "/home/mou/.barony".L.argument = "/home/mou/misc/games/barony";
     "/home/mou/.mozilla".L.argument = "/home/mou/misc/.app-data/mozilla";
     "/home/mou/.ssh".L.argument = "/home/mou/misc/.app-data/ssh";