Start with systemd unit

[Stadicus]

This is more of a question than an issue, hope you don't mind.

I can start the lnd-explorer just fine from the command line using npm start directly from within the directory. But I'd like to run it on startup directly after LND. Everything is automated using systemd (see my RaspiBolt guide for details).

• How can I start the application with a single command from outside the directory?
• Can I pass the environment variables directly instead of setting them first?

Thanks in advance! :-)