chore: Update CODEOWNERS to remove stale entries

Removes several entries from the .github/CODEOWNERS file that appear
to be stale or no longer relevant. This will help ensure that code
ownership is accurately reflected in the repository.

.github/CODEOWNERS

@@ -24,40 +24,3 @@
 # *.js @js-owner
 # *.css @css-owner
 
-# Nix files
-*.nix @cafkafk
-
-# Documentation
-*.md @cafkafk
-
-# Configuration
-*.toml @cafkafk
-
-# Version bumps
-Cargo.lock @cafkafk
-
-# Testing, builds, etc
-devtools/* @cafkafk
-tests/* @cafkafk
-xtests/* @cafkafk
-
-# Debian files
-devtools/deb-package.sh @gierens
-deb.asc @gierens
-
-# Nushell completions
-completions/nush/* @PThorpe92
-
-# Grid + Output 
-src/output/grid.rs @PThorpe92
-src/output/grid_details.rs @PThorpe92
-src/output/file_name.rs @PThorpe92 @gierens
-
-# Config + config parsing
-src/options/config.rs @PThorpe92 @gierens
-src/options/theme.rs @PThorpe92 @gierens
-src/theme/* @PThorpe92 @gierens
-themes/* @PThorpe92 @gierens
-
-# Options parsing
-src/options/* @MartinFillon