[docs] Getting started refactor (#2534)

* docs: Add comprehensive Getting Started guide with benchmarks

- Add new Getting Started documentation with PyTorch and JAX tutorials
- Include benchmark scripts demonstrating TE performance benefits
- Add CSS styling for code output and tabs
- Replace old quickstart notebooks with improved documentation
- Add transformer layer diagram (SVG)
- Update docs configuration and workflow
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

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* fix
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* fix
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

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Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>

---------
Signed-off-by: Pawel Gadzinski <pgadzinski@nvidia.com>
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docs/index.rst

@@ -29,7 +29,7 @@ Transformer Engine documentation
    :caption: Getting Started
 
    installation
-   getting_started
+   getting_started/index
    faq
 
 .. toctree::