[FEATURE]: doppler import supporting loading a template via a URL
The template value supplied to doppler init should also be able to accept a URL.
My reasoning is that we want to be able to help folks easily set up a Doppler project for open source applications, but it's highly unlikely in most cases that we'll get a doppler.yaml file merged into the source repo, official Dockerfile etc.
Being able to run something like doppler import https://github.com/DopplerUniversity/doppler-app-templates/blob/main/templates/mongodb-tls.yaml would allow us to document how users can still use doppler import with examples that we provide.
We now have an Open Source repository for project templates at https://github.com/DopplerUniversity/doppler-app-templates