docs(readme): lead the smart graph with grouping, not linking

[Leo310]

README-only. The intro sentence ("the graph reveals how they connect") and the install note ("graph clustering") framed the smart graph as an auto-linker, while the site leads with grouping the vault into topics. Reworded four spots to match:

• Intro: the graph groups notes into the topics the vault is actually about.
• Hero alt text: names the grouped topics.
• Feature bullet: works out what the vault is about from links, tags, and content, nothing to maintain (tags are new in 2.1.0).
• Install: an embedding model gives topics that read what notes say, not just how they link. Topics from links alone already work without one, so "unlock graph clustering" was inaccurate.

No feature detail added; the README stays a pitch with links to the site.

AI assistance: written with AI coding agents from the maintainer's brief; reviewed and tested by the maintainer.

[greptile-apps]

Greptile Summary

The README now presents the Smart Graph as grouping notes into topics based on links, tags, and content. The follow-up revision also clarifies that users must select an embedding model separately for search and the graph.

• Aligns the introduction, hero alt text, feature description, and installation guidance with topic grouping.
• Clarifies the configuration needed for semantic search and content-aware graph topics.

Confidence Score: 5/5

The documentation-only PR appears safe to merge.

No new actionable issues were found, and the current wording fully addresses the previously reported ambiguity about configuring embeddings separately for search and the graph.

Important Files Changed

Filename	Overview
README.md	Reframes Smart Graph messaging around topic grouping and accurately clarifies embedding-model selection for both search and graph features.

_{Reviews (2): Last reviewed commit: "docs(readme): say the embedding model is..." | Re-trigger Greptile}