GitLab

* Update README.rst - Installation section

Added pip install instructions and cleaned up pre-reqs and FlashAttention-2 section
Signed-off-by: Santosh Bhavani <santosh@semantic.md>

* Update README.rst
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>

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Signed-off-by: Santosh Bhavani <santosh@semantic.md>
Signed-off-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>
Co-authored-by: Kirthi Shankar Sivamani <ksivamani@nvidia.com>