Off-network operation with Lightsail server

[mayacakmak]

Charlie has a way of enabling a robot to be operated over the WWW using Amazon Lightsail. He has added the relevant code to the upstream repository with documentation, which we will merge. He also has documentation about their Lightsail setup here:

https://github.com/hello-robot/stretch_web_interface#server_lightsail

We hope to replicate this setup with our lab's AWS account. This will enable Henry and others to operate our Stretch remotely, without requiring VPN and what not, as in our user study.