Updated "drenv setup" documented step as it lead to an misleading error

[pruthvitd]

Updated documentation step "drenv setup" as it lead to following error:

$ drenv setup
usage: drenv setup [-h] [-v] [--name-prefix PREFIX] filename
drenv setup: error: the following arguments are required: filename

[nirs]

@pruthvitd do you plan to update this?

[pruthvitd]

@pruthvitd do you plan to update this?

Hi @nirs Could you please review, the changes suggested have been incorporated.

[nirs]

Removed documentation step "drenv setup" as its unnecessary and leads to following error:

$ drenv setup usage: drenv setup [-h] [-v] [--name-prefix PREFIX] filename drenv setup: error: the following arguments are required: filename

Need to update to reflect the actual change.

[nirs]

Please squash the commits, we want clean git history with one commit per logical change.

[nirs]

Thanks