drop git-crypt from the repo

README.md

@@ -110,7 +110,6 @@ Thanks to Cachix for sponsoring our binary cache!
 * ./deploy - Deploy script
 * ./nix - pinned Nix dependencies and overlays
 * ./roles - shared NixOS configuration modules
-* ./secrets - git-crypt encrypted secrets
 * ./services - single instances of NixOS services
 * ./terraform - Setup DNS
 * ./users - NixOS configuration of our admins

secrets/.gitattributes

@@ -1,2 +0,0 @@
-* filter=git-crypt diff=git-crypt
-.gitattributes !filter !diff

shell.nix

@@ -9,7 +9,6 @@ mkShell {
   ];
 
   buildInputs = with pkgs; [
-    git-crypt
     terraform
     (terraform.withPlugins (
       p: [