docs: fold Multimodal Data into the Table page, and repair stale links

Multimodal Data becomes a section of Table, between Data types -- which
introduces blobs -- and Schema evolution.

The rest is link repair. Earlier merges left links pointing at pages that had
moved, which the redirect table covered but the link checker does not follow,
so they were broken in the rendered site: /catalog, /lance, /namespaces,
/tables-and-namespaces, /search/multivector-search, /search/explain-analyze and
/basics/data-types#blob.

The redirect table itself had two conflicting entries for /tables/multimodal and
four pointing at reranking pages that no longer exist; both are fixed.

docs/web/docs.json

@@ -73,7 +73,7 @@
     },
     {
       "source": "/tables/multimodal",
-      "destination": "/basics/data-types#blob"
+      "destination": "/management/table#multimodal"
     },
     {
       "source": "/search/select",
@@ -220,7 +220,6 @@
               "management/database",
               "management/namespace",
               "management/table",
-              "tables/multimodal",
               "tables/branching",
               "management/materialized-view",
               "management/function"