readme technical issues

[morrisalp]

I noticed a few points that could be clarified in the readme:

1 . The recommendation to run "git clone https://github.com/cdli-gh/data" is very slow because it fetches all historical commits, adding the flag "--depth 1" only fetches the most recent commit which is very fast.

2. Typo: "git lsf" should be "git lfs"

3. For me "git lfs fetch ." didn't work ("no remote named .") but just "git lfs fetch" did work properly.

[epageperron]

Thanks a lot! I was waiting to edit on the server as we were overwriting the repo daily but we have to prepare the dumps from the new framework now and these exports are being discontinued.