fix(readme): update broken links and modernize project description

[sbhavani]

Description

Update README to fix broken links and update description

Type of change

• Documentation change (change only to the documentation, either a fix or a new content)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Infra/Build change
• Code refactoring

Changes

Please list the changes introduced in this PR:

• Fix broken getting_started.html link (404) → index.html
• Update redirected URLs: lambdalabs.com → lambda.ai, mosaicml.com → databricks.com
• Modernize "What is Transformer Engine?" to reference current model architectures (LLMs, MoE, multimodal) instead of dated examples (BERT, GPT, T5)
• Reframe TE value proposition around optimizations for advanced features (MoE, parallelism, fused ops) with low precision

Checklist:

• I have read and followed the contributing guidelines
• The functionality is complete
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[greptile-apps]

Greptile Summary

This PR updates README.rst to fix a broken documentation link, modernize the "What is Transformer Engine?" description to reference LLMs/MoE/multimodal architectures, and redirect stale external URLs (lambdalabs.com → lambda.ai, mosaicml.com → databricks.com). However, the link-fix introduced a duplicate "Getting Started Guide" sentence (lines 140–141) — the original single line was replaced by two lines pointing to different URLs — and the blank line separating the Flax code block from that paragraph was also removed.

Confidence Score: 4/5

• The PR is close to merge-ready but has one P1 defect — a duplicate sentence that will visibly render in the published README.
• All URL and description changes are correct and well-motivated. The single blocking issue is the duplicate "Getting Started Guide" line (140–141) introduced when the old broken link was replaced by two competing lines instead of one.
• README.rst lines 140–141 — the duplicate sentence must be resolved before merging.

Important Files Changed

Filename	Overview
README.rst	Documentation update fixing broken links and modernizing description, but introduces a duplicate "Getting Started Guide" sentence and drops the blank line separating the code block from the following paragraph.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.rst changes] --> B[Description modernized\nLLMs / MoE / multimodal]
    A --> C[External URL redirects]
    A --> D[Getting Started link fix]
    C --> C1[lambdalabs.com → lambda.ai]
    C --> C2[mosaicml.com → databricks.com\ntable + Previous News]
    D --> D1["getting_started/index.html ✅"]
    D --> D2["index.html ❌ duplicate line"]

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_{Reviews (2): Last reviewed commit: "Update README.rst" | Re-trigger Greptile}

[ptrendx]

Duplicate line.