niv: remove home-manager

(not used for anything atm)

common/users.nix

@@ -2,8 +2,6 @@
 
 {
 
-  home-manager.useGlobalPkgs = true;
-
   users.users = {
     root = {
       openssh.authorizedKeys.keys = with pkgs.lib; concatLists (mapAttrsToList (name: user: if elem "wheel" user.extraGroups then user.openssh.authorizedKeys.keys else []) config.users.users);

nix/sources.json

@@ -1,16 +1,4 @@
 {
-    "home-manager": {
-        "branch": "release-22.05",
-        "description": "Manage a user environment using Nix  [maintainer=@rycee] ",
-        "homepage": "https://nix-community.github.io/home-manager/",
-        "owner": "nix-community",
-        "repo": "home-manager",
-        "rev": "6639e3a837fc5deb6f99554072789724997bc8e5",
-        "sha256": "0vg6x7cw2bpiga9k6nlj2n1vrm4qw84721gmlhp3j1i58v100ybc",
-        "type": "tarball",
-        "url": "https://github.com/nix-community/home-manager/archive/6639e3a837fc5deb6f99554072789724997bc8e5.tar.gz",
-        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
-    },
     "mattermost-server": {
         "branch": "master",
         "description": "Open source Slack-alternative in Golang and React - Mattermost",