* Updates to the documentation - Maxim (#2869)

* Updates to the docs (#2871)

* add more docs in single animal userguide

* unify train_network docs

* unify train_network docs

* improved augmentation code

* remove link to 3mice TF Colab on homepage

* Update readme and conda env

* Update readme

* docs/pytorch/user_guide Installation: point to docs/installation

* Standardize subtitiles accross single and multi user guides

* Add missing docstring

* improved installation docs

* added quick commands

* improved docs

* install torch and torchvision with pip in the DeepLabCut Conda file

* updated labelling in userguides

* Update DEEPLABCUT.yaml

* install deeplabcut through the pre-release

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Co-authored-by: Niels <45132115+n-poulsen@users.noreply.github.com>
Co-authored-by: Niels Poulsen <niels.poulsen@epfl.ch>
Co-authored-by: Mackenzie Mathis <mathis@rowland.harvard.edu>