On first install, or if missing config.json, create a basic template automatically

Instead of requiring the user to copy config.json.template to config.json, the server should automatically attempt to create the file if it doesn't detect it. This way the setup is as easy as starting the server and using the website.

- User runs `npm run start`
- Server detects that config.json is missing.
- Server copies or creates a default config.json using some template.
- User navigates to the website and reconfigures the config.