docs: list features in the landing page comparison table (#4743)

## Summary

Replaces the generated availability table under **Compare features** on
the landing page with a hand-written list of features, grouped by area,
with separate Embedded and Enterprise columns.

The generated table listed every page that declares `availability`,
including overview and basic CRUD pages. Rows such as "Overview"
appeared three times without context, and pages like Insert, Update,
Database and the integrations showed up as if they were features.

| Area | Features |
| --- | --- |
| Search | Vector, full-text and hybrid search, filtering, reranking,
query plans, distributed search |
| Indexing | Vector, full-text and scalar indexes |
| SQL and curation | SQL, aggregation, sampling, joins, ranking and
deduplication, near-duplicate detection, chunking, changes since a
version, views |
| Feature engineering | Computed columns, materialized views, embedding
registry |
| Training | PyTorch data loader, permutations, distributed training |
| Data management | Branches, compaction and cleanup, background jobs,
Real Time engine |
| Security | Authentication, authorization |

Each ✅/❌ matches the linked page's `availability` on `main`; SQL, which
declares none, is Enterprise-only. Functions are left out until it's
settled whether they are published.

The same list, limited to 1.10 features, is in the Enterprise 1.10
editions in lancedb/docs#398.

Checked by assembling the docs site with this change: `mint validate`
passes and `mint broken-links --check-anchors --check-redirects` finds
no broken links. Vale reports no new warnings.

After this merges, the committed `lancedb` skill in lancedb/docs needs a
rebuild (`make assemble && make skill`).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

docs/web/index.mdx

@@ -119,7 +119,39 @@ To set up LanceDB Enterprise in your organization, [reach out to us](https://www
 
 ### Compare features {#compare}
 
-{/* availability-comparison */}
+| Area | Feature | Embedded | Enterprise |
+| --- | --- | :-: | :-: |
+| **Search** | [Vector search](/search/vector-search) | ✅ | ✅ |
+|  | [Full-text search](/search/full-text-search) | ✅ | ✅ |
+|  | [Hybrid search](/search/hybrid-search) | ✅ | ✅ |
+|  | [Filtering](/search/filtering) | ✅ | ✅ |
+|  | [Reranking](/reranking) | ✅ | ✅ |
+|  | [Query plans](/search/explain) | ✅ | ✅ |
+|  | [Distributed search](/enterprise/distributed-search) | ❌ | ✅ |
+| **Indexing** | [Vector indexes](/indexing/vector-index) | ✅ | ✅ |
+|  | [Full-text indexes](/indexing/fts-index) | ✅ | ✅ |
+|  | [Scalar indexes](/indexing/scalar-index) | ✅ | ✅ |
+| **SQL and curation** | [SQL (Arrow Flight SQL)](/basics/sql) | ❌ | ✅ |
+|  | [Aggregation and profiling](/curation/aggregate) | ❌ | ✅ |
+|  | [Sampling](/curation/sampling) | ❌ | ✅ |
+|  | [Joins](/curation/join) | ❌ | ✅ |
+|  | [Ranking and deduplication](/curation/windowing) | ❌ | ✅ |
+|  | [Near-duplicate detection](/curation/dedupe) | ❌ | ✅ |
+|  | [Chunking](/curation/chunking) | ❌ | ✅ |
+|  | [Changes since a version](/curation/changes) | ❌ | ✅ |
+|  | [Views](/management/view) | ❌ | ✅ |
+| **Feature engineering** | [Computed columns, with refresh](/feature-engineering/add-computed-column) | ✅ | ✅ |
+|  | [Materialized views](/management/materialized-view) | ❌ | ✅ |
+|  | [Embedding registry](/embedding) | ✅ | ✅ |
+| **Training** | [PyTorch data loader](/training/data-loading) | ✅ | ✅ |
+|  | [Permutations](/training/permutation) | ✅ | ✅ |
+|  | [Distributed training](/training/distributed-training) | ✅ | ✅ |
+| **Data management** | [Branches](/tables/branching) | ✅ | ✅ |
+|  | [Compaction and cleanup](/maintenance/compaction) | ✅ | ✅ |
+|  | [Background jobs (managed indexing and maintenance)](/maintenance/background-jobs) | ❌ | ✅ |
+|  | [Real Time engine (streaming writes and reads)](/tables/realtime-engine) | ❌ | ✅ |
+| **Security** | [Authentication](/enterprise/authentication) | ❌ | ✅ |
+|  | [Authorization](/governance/authorization) | ❌ | ✅ |
 
 ## Projects using LanceDB {#projects-using-lancedb}