overlays: Drop zola

No longer necessary since I no longer use zola and would rather not deal
with unnecessarily compiling it.

modules/shell.nix

@@ -50,7 +50,6 @@ in
           recode
           rmlint
           jpegoptim
-          zola
           pass
           ;
         inherit (pkgs)

overlays/zola.nix

@@ -1,5 +0,0 @@
-final: prev: {
-  zola = prev.zola.overrideAttrs (oldAttrs: {
-    patches = (oldAttrs.patches or [ ]) ++ [ ../patches/zola-serve-fix.patch ];
-  });
-}

patches/zola-serve-fix.patch

@@ -1,44 +0,0 @@
-From d9d41a0d919d90008e4c0db31cc86786ca502aa1 Mon Sep 17 00:00:00 2001
-From: Andrew Langmeier <raymi306@gmail.com>
-Date: Sun, 13 Aug 2023 17:34:32 +0000
-Subject: [PATCH] Add fix for detecting changes on files by editors which
- replace files on save, such as vi
-
----
- src/cmd/serve.rs | 23 +++++++++++++++++++++++
- 1 file changed, 23 insertions(+)
-
-diff --git a/src/cmd/serve.rs b/src/cmd/serve.rs
-index 46e8d9345..35fd85f1f 100644
---- a/src/cmd/serve.rs
-+++ b/src/cmd/serve.rs
-@@ -653,6 +653,29 @@ pub fn serve(
-                         };
-                         messages::report_elapsed_time(start);
-                     }
-+                    NoticeRemove(path) => {
-+                        // Some editors, like those in the vi family, replace the file you're
-+                        // working on with a copy, breaking the watcher.
-+                        //
-+                        // See https://github.com/notify-rs/notify/issues/247
-+                        //
-+                        // If we need to watch other single required files, should handle them
-+                        // here. For now, just config.toml needs special handling
-+                        match detect_change_kind(root_dir, &path, &config_path) {
-+                            (ChangeKind::Config, _) => {
-+                                console::info("-> Config changed. The browser needs to be refreshed to make the changes visible.");
-+
-+                                if let Some(s) = recreate_site() {
-+                                    site = s;
-+                                }
-+                                let entry = config_path_rel.to_str().unwrap_or("config.toml");
-+                                watcher
-+                                    .watch(root_dir.join(entry), RecursiveMode::Recursive)
-+                                    .with_context(|| format!("Can't watch `{}` for changes in folder `{}`. Does it exist, and do you have correct permissions?", entry, root_dir.display()))?;
-+                            }
-+                            _ => {}
-+                        }
-+                    }
-                     _ => {}
-                 }
-             }