rewrite usage of virtualenv in firstrun docs

[tardyp]

This ticket is a migrated Trac ticket 3483

People contributed to the original ticket: @rutsky
Ticket created on: Mar 14 2016
Ticket last modified on: Jun 07 2016

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Currently we create virtualenv and do all command from inside of virtualenv, which sounds horrible to me: virtualenv should be used as opaque directory with minimal usage of internal structure.

Also these commands doesn't work on windows, since pip and other scripts are inside Scripts/ directory, not bin/.

I suggest to rewrite docs to use virtualenv activation as it was done in eight branch.

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[seankelly]

Docs are using activation. They are *nix specific however for creation and activation.