chore: Remove traces of Hound

We can always revert this if we want it back.

Change-Id: I1332b6dd541199584b7b5b94a8651172d79e53a9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/442
Reviewed-by: glittershark <grfn@gws.fyi>
Reviewed-by: lukegb <lukegb@tvl.fyi>

ops/nixos/hound.nix

@@ -1,62 +0,0 @@
-# This module serves hound.
-#
-# https://github.com/hound-search/hound
-{ pkgs, config, lib, ... }:
-
-let
-  cfg = config.services.depot.hound;
-  configJson = with builtins; toFile "config.json" (toJSON {
-    inherit (cfg) title repos;
-    max-concurrent-indexers = cfg.maxConcurrentIndexers;
-    dbpath = "/var/lib/hound";
-    health-check-uri = "/healthz";
-  });
-in {
-  options.services.depot.hound = with lib; {
-    enable = mkOption {
-      type        = types.bool;
-      default     = false;
-      description = ''
-        Whether to enable the hound code search engine to forward
-        journald logs to Stackdriver Logging.
-      '';
-    };
-
-    repos = mkOption {
-      type = lib.types.attrs;
-      description = "Repository configuration for hound.";
-    };
-
-    port = mkOption {
-      type = lib.types.int;
-      default = 6080;
-      description = "The port hound should listen on.";
-    };
-
-    title = mkOption {
-      type = lib.types.str;
-      description = "Page title for this hound instance";
-    };
-
-    maxConcurrentIndexers = mkOption {
-      type = lib.types.int;
-      default = 2;
-    };
-  };
-
-  config = {
-    systemd.services.hound = {
-      description = "Code search engine";
-      script = "${config.depot.third_party.hound}/bin/houndd -addr ':${toString cfg.port}' -conf '${configJson}'";
-      wantedBy = [ "multi-user.target" ];
-      path = [ pkgs.git ];
-
-      serviceConfig = {
-        Restart = "always";
-        DynamicUser = true;
-        StateDirectory = "hound";
-        SupplementaryGroups = "git";
-      };
-    };
-  };
-}