Currectly echo start just works by copy pasting the folder from https://github.com/Merit-Systems/echo/tree/master/templates

What we could do is allow echo-start to use a full github url as the "name" of the template, which would then just cp this template instead.

so instead of

npx echo-start@latest echo-start --template next-chat --app-id 756ee0c9-74d1-48c7-8443-60f2494df6f1

it would be

npx echo-start@latest echo-start --template <url to the github repo with the starter template> --app-id 756ee0c9-74d1-48c7-8443-60f2494df6f1