Move nsfw to dependencies, remove napi & murmur2 binaries.

[Eskaan]

• Moved native napi binaries out of os specific folders and fully added the public/native folder to the gitignore.
• Added nsfw as dev dependency and added a script to copy it into the natives folder, now it auto-updates and we don't have to keep the binary in the git history.
• The public/native folder is now created automatically.
• Deleted the now no longer used murmur2 binaries.