start refactoring shared code into modules, update the lock, do some other minor fixes

modules/nixos/shared-packages/server-settings/default.nix

@@ -0,0 +1,19 @@
+{...}: {
+  imports = [
+    ./conduit
+    ./forgejo
+    ./gotosocial
+    ./mail-server
+    ./nextcloud
+    # ./phanpy
+    ./postgres
+    ./roundcube
+    ./coturn
+    # ./dashboard
+    #./cinny
+    #./firefox-sync
+    ./writefreely
+    ./mollysocket
+    ./jellyfin
+  ];
+}