matrix: moved to own dir + added housecleaning

machines/gerd/services/matrix/element.nix

@@ -0,0 +1,42 @@
+{ config, pkgs, ... }:
+
+let
+  svc_domain = "chat.${config.mine.shared.settings.domain}";
+
+  # configure element web client 
+  pkg_element = pkgs.element-web.override {
+    conf = {
+      default_server_name = config.mine.shared.settings.domain;
+      embedded_pages.login_for_welcome = true;
+      disable_guests = true;
+
+      brand = config.mine.shared.settings.brand;
+      default_theme = "dark";
+
+      features = {
+        feature_latex_maths = true;
+        feature_video_rooms = false;
+      };
+    };
+  };
+in {
+  services.nginx.virtualHosts."${svc_domain}" = {
+    forceSSL = true;
+    enableACME = true;
+    locations."/".root = pkg_element;
+  };
+
+  mine.shared.meta.element = {
+    name = "Element";
+    description = "We host our own Element instance, get on it and start chatting!";
+    url = "https://${svc_domain}";
+
+    package = let
+      pkg = pkg_element;
+    in {
+      name = pkg.pname;
+      version = pkg.version;
+      meta = pkg.meta;
+    };
+  };
+}