docs: Moving trainium from Blueprints to GenAI

[sheetaljoshi]

What does this PR do?

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Trainium on EKS is better suited to be under Gen AI -> Training -> BERT-Large on Trainium section. I recommend moving this content under Gen AI for better indexing, search ability, as well as avoiding duplication of the content.

Motivation

It make sense to move the training under Gen AI for better indexing and searchability.

More

• Yes, I have tested the PR using my local account setup (Provide any test evidence report under Additional Notes)
• Mandatory for new blueprints. Yes, I have added a example to support my blueprint PR
• Mandatory for new blueprints. Yes, I have updated the website/docs or website/blog section for this feature
• Yes, I ran pre-commit run -a with this PR. Link for installing pre-commit locally

For Moderators

• E2E Test successfully complete before merge?

Additional Notes

[vara-bonthu]

Thanks for the PR @sheetaljoshi ! Let's retain the original Trainium.md document for deploying the Trainium blueprint which hosts number of Gen AI blueprints.

We'll transfer only the BERT-Large Training on Trainium example blueprint deployment to the GEN AI page. The BERT Large example blueprint will reference Trainium.md as a prerequisite.

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