git protocol should be supported

[hoatle]

protocol:

https://:location#:relative-file-path
git://:location#:relative-file-path

for example:

• https://gist.github.com/e7e06874c5a7b84d220ff5faf0a2c3a5.git#.env-type-config
• git@gist.github.com:e7e06874c5a7b84d220ff5faf0a2c3a5.git#.env-type-config

make sure to support different auth mechanisms for this protocol (basic auth, ssh, etc).