common: move to modules, move some files out, modules: adjust dir structure

modules/nixos/services/homeserver/vaultwarden.nix

@@ -0,0 +1,29 @@
+{ config, ... }:
+
+{
+  sops.secrets."vaultwarden/secrets.env".restartUnits = [ "vaultwarden.service" ];
+
+  services.caddy.virtualHosts."vaultwarden.taild5f7e6.net".extraConfig =
+    assert config.services.caddy.enable;
+    ''
+      import default-settings
+
+      bind tailscale/vaultwarden
+
+      # block connections to admin login
+      respond /admin/* 403
+
+      reverse_proxy localhost:8000
+    '';
+
+  services.vaultwarden = {
+    enable = true;
+    backupDir = "/var/backups/vaultwarden";
+    config = {
+      DOMAIN = "https://vaultwarden.taild5f7e6.ts.net";
+
+      SIGNUPS_ALLOWED = false;
+    };
+    environmentFile = config.sops.secrets."vaultwarden/secrets.env".path;
+  };
+}