Fix ox-hugo export with internal ID links and Quartz config

- Add org-id resolution for [[id:...]] links by building ID locations
  database once before parallel export
- Handle broken file links gracefully with org-export-with-broken-links
- Fix race condition in parallel exports by pre-building ID cache
- Fix Quartz config not being applied: cp was preserving nix store hash
  prefix in filename instead of using explicit destination filename
- Continue pipeline even when some exports fail, reporting failures
- Improve error handling and logging throughout export pipeline

README.org

@@ -1,6 +1,7 @@
 #+title: org-garden
 
-An [[https://orgmode.org/][org-roam]] to static website publishing pipeline. Converts =.org= notes into a rendered site using Emacs/[[https://ox-hugo.scripter.co/][ox-hugo]] for export and [[https://quartz.jzhao.xyz/][Quartz 4]] for site generation.
+An [[https://orgmode.org/][org-roam]] to static website publishing pipeline. Converts =.org= notes into a rendered site using
+Emacs/[[https://ox-hugo.scripter.co/][ox-hugo]] for export and [[https://quartz.jzhao.xyz/][Quartz 4]] for site generation.
 
 * Usage
 
@@ -33,7 +34,7 @@ A NixOS module is provided for running org-garden as a systemd service:
 
 #+begin_src nix
 {
-  inputs.org-garden.url = "github:ignacio.ballesteros/org-garden";
+  inputs.org-garden.url = "git+https://gitea.bueso.eu/ignacio.ballesteros/org-garden";
 
   outputs = { self, nixpkgs, org-garden }: {
     nixosConfigurations.myhost = nixpkgs.lib.nixosSystem {
@@ -42,7 +43,6 @@ A NixOS module is provided for running org-garden as a systemd service:
         {
           services.org-garden = {
             enable = true;
-            package = org-garden.packages.x86_64-linux.default;
             notesDir = /path/to/notes;
             port = 8080;
           };