biotite: move services to new machines and new domain

- related services: forgejo, miniflux, vaultwarden
- moved from xinyang.life to xiny.li
- clean up modules

machines/biotite/services/vaultwarden.nix

@@ -0,0 +1,25 @@
+{ config, my-lib, ... }:
+let
+  inherit (my-lib.settings) vaultwardenUrl;
+in
+{
+  services.vaultwarden = {
+    enable = true;
+    dbBackend = "sqlite";
+    config = {
+      DOMAIN = "${vaultwardenUrl}";
+      SIGNUPS_ALLOWED = false;
+
+      ROCKET_ADDRESS = "127.0.0.1";
+      ROCKET_PORT = 8222;
+
+      ROCKET_LOG = "normal";
+    };
+  };
+
+  services.caddy = {
+    virtualHosts.${vaultwardenUrl}.extraConfig = with config.services.vaultwarden.config; ''
+      reverse_proxy ${ROCKET_ADDRESS}:${toString ROCKET_PORT}
+    '';
+  };
+}