I wish something like .config would be a thing for storing configuration files in repositories. Instead we have a .vscode, .github, .gitlab, .idea, .vs, etc

Convenience for end-users and avoiding link rot is probably one of the reasons.

While Vaultwarden is great I would not suggest selfhosting your password manager unless you do regular backups. Losing all your password cause your server went down is a great way to ruin your day.