Minor fix in documentation for uv

[Dooruk]

Should be:

cd $NOBACKUP  
mkdir swell-project
cd swell-project
git clone [email protected]:geos-esm/swell swell-develop

Can be fixed easily with another PR

also add checkout branch option
fix the import pathlib in pr for letkf

thanks @mjkagnes123 for testing

From Meta:

A little problem in https://geos-esm.github.io/swell/#/launching_an_experiment
I wanted to run an experiment I set up last week so I didn't have the printout of how to launch the experiment. From the page above, I tried to run following the instructions under 'Launching an experiment' and swell didn't recognize the argument '--suite_path'. Running 'swell launch --help' indicates that the suite path is a positional argument so we need to remove the '--suite_path' part.

[mjkagnes123]

Worked! Thanks.