docs: link home page sections through /index (#4740)

## Summary

Changes links to home page sections from `/#<anchor>` to
`/index#<anchor>`.

The docs site's Assemble CI fails `mint broken-links --check-anchors` on
every `/#architecture` link since #4732 moved the Architecture page onto
the home page. The anchor exists; Mint 4.2.888's checker can't resolve
any anchor on the root page `/`, but resolves `/index#…`.
`docs.lancedb.com/index` serves the home page, so readers land in the
same place.

Verified by assembling the site with this change and the matching
Enterprise docs change: `mint validate` passes and `mint broken-links
--check-anchors --check-redirects` finds no broken links. The
`docs.json` redirects keep `/#architecture`, which the checker accepts.

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

---------

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

docs/web/basics/guarantees.mdx

@@ -88,4 +88,4 @@ cannot undo `drop_table`.
 - [Cleanup](/maintenance/cleanup): configure retention and understand protected versions.
 - [Jobs](/basics/jobs): distinguish submission, completion and cancellation.
 - [Refresh a computed column](/feature-engineering/refresh-column): understand partial progress.
-- [Architecture](/#architecture): understand storage and background maintenance.
+- [Architecture](/index#architecture): understand storage and background maintenance.

docs/web/basics/lance.mdx

@@ -42,4 +42,4 @@ those fields together.
 - [Lance format specification](https://lance.org/format): how the format works.
 - [Table versioning](/management/table#versioning): read and manage table versions.
 - [Computed columns](/feature-engineering/add-computed-column): add derived features to your data.
-- [Architecture](/#architecture): how LanceDB Embedded and Enterprise build on Lance.
+- [Architecture](/index#architecture): how LanceDB Embedded and Enterprise build on Lance.

docs/web/enterprise/benchmarks.mdx

@@ -10,7 +10,7 @@ keywords: ["benchmarks", "performance", "throughput", "latency"]
 
 This page describes a LanceDB Enterprise capability. The embedded form
 of LanceDB has no server to provide it. See
-[Architecture](/#architecture) for what differs between the two.
+[Architecture](/index#architecture) for what differs between the two.
 
 Benchmark results are specific to a deployment's shape (cluster size, storage
 class, dataset), so they are published with LanceDB Enterprise.

docs/web/enterprise/deployment/kubernetes.mdx

@@ -10,7 +10,7 @@ keywords: ["kubernetes", "k8s", "aks", "deployment", "helm"]
 
 This page describes a LanceDB Enterprise capability. The embedded form
 of LanceDB has no server to provide it. See
-[Architecture](/#architecture) for what differs between the two.
+[Architecture](/index#architecture) for what differs between the two.
 
 The Kubernetes deployment procedure is published with LanceDB Enterprise. See
 [LanceDB Enterprise](/enterprise#deployment) for the general shape, and

docs/web/enterprise/distributed-search.mdx

@@ -11,7 +11,7 @@ availability:
 Distributed search spreads index execution, table-data reads, and caching across
 multiple serving machines in LanceDB Enterprise. Query nodes plan queries and
 combine results. Plan executors cache index structures and table data and execute
-the remote work. See [Architecture](/#architecture).
+the remote work. See [Architecture](/index#architecture).
 
 ## Embedded search {#embedded-search}
 

docs/web/enterprise/index.mdx

@@ -10,7 +10,7 @@ keywords: ["enterprise", "deployment", "cluster"]
 
 This page describes a LanceDB Enterprise capability. The embedded form
 of LanceDB has no server to provide it. See
-[Architecture](/#architecture) for what differs between the two.
+[Architecture](/index#architecture) for what differs between the two.
 
 LanceDB Enterprise runs the lakehouse as a service: a control plane for
 configuration, identity and policy; a data plane serving reads and writes; and
@@ -30,7 +30,7 @@ Draft for the Functions release. Add this row to the table above, after SQL:
 | [Functions](/management/function) | Python running on workers |
 */}
 
-See [Architecture](/#architecture) for the two shapes side by side.
+See [Architecture](/index#architecture) for the two shapes side by side.
 
 ## Getting a deployment {#deployment}
 
@@ -39,4 +39,4 @@ published with LanceDB Enterprise rather than here.
 [Contact us](https://www.lancedb.com/contact) to get started; see the
 [Kubernetes deployment guide](/enterprise/deployment/kubernetes) for a worked example.
 Embedded LanceDB has nothing to deploy: it is a library your process links
-against -- see [LanceDB Embedded](/#1-lancedb-oss).
+against. See [LanceDB Embedded](/index#1-lancedb-oss).

docs/web/enterprise/security.mdx

@@ -10,7 +10,7 @@ keywords: ["compliance", "security", "soc2", "encryption", "audit"]
 
 This page describes a LanceDB Enterprise capability. The embedded form
 of LanceDB has no server to provide it. See
-[Architecture](/#architecture) for what differs between the two.
+[Architecture](/index#architecture) for what differs between the two.
 
 Compliance posture (certifications, data residency, encryption at rest and in
 transit, audit logging) is a property of a deployment, so it is documented