Preconfiguration for Web Standalone

[pckilgore]

I'd like to contribute a feature for use with docker that allows me to bind mount "default configuration" from a backup json file.
Then serve the file via express, and have the web-standalone expose an option (if the file exists) to restore restfox to that "default" state.

This solves the issue for me of giving my team a ready-to-use restfox in our local docker compose development setup. Right now I'm distributing a backup file via side channels to share environments + an auth plugin to colleagues.

Let me know if that tracks with product goals.

[flawiddsouza]

Seems like a very specific use case but I'll be happy to accept your PR and merge it.