Stop Redirecting Old Post Slugs
Stops WordPress from redirecting a post's previous URLs after its slug changes, for when you want an old address to be free or truly gone.
Snippet Library
Disable Features snippets for WordPress
Snippets that switch off WordPress features you do not use: comments, the block editor, RSS feeds, automatic updates, attachment pages and more. One snippet per feature, so you turn off exactly what you want and nothing else.