Serve llama 2

[casperdcl]

while working on tests in #59, stumbled on this:

wget https://prem-models.s3.eu-central-1.amazonaws.com/llama-v2/llama-2-7b-hf.zip
403 Forbidden

[biswaroop1547]

@casperdcl should be working now if you retry, had to make the files public in s3.