docs: add the FineWeb EDU and DROID demos to the gallery

Carries over production's #368 (deploy-freeze 113db11c), which landed after
this branch's gallery was split into a page per demo. Each demo gets a page
in that layout with production's card, badges and link, and a row in the
overview table and the sidebar. The two hero images are byte-identical to
production's.

docs/web/demos/fineweb-edu-search.mdx

@@ -0,0 +1,20 @@
+---
+title: "Large scale vector search (1.5B)"
+sidebarTitle: "Large Scale Vector Search"
+description: "Semantic search over 1.5B+ FineWeb EDU embeddings."
+icon: database
+---
+
+<Badge color="purple">vector-search</Badge>
+<Badge color="blue">education</Badge>
+<Badge color="gray">bge-embeddings</Badge>
+
+<Card
+  title="Large Scale Vector Search (1.5B)"
+  img="/static/assets/images/demos/fineweb_edu_hero.svg"
+  href="https://lancedb-demos.vercel.app/demo/fineweb-edu-search"
+>
+Semantic search over curated FineWeb EDU pages, represented as 1.5B+ BGE embeddings. Inspect the
+query plan to see how LanceDB serves vector search at billion scale.
+
+</Card>

docs/web/demos/index.mdx

@@ -13,3 +13,5 @@ works.
 | [Semantic.art](/demos/semantic-art) | Multimodal art discovery using feelings, phrases, and images. |
 | [Wikipedia 41M hybrid search](/demos/wikipedia-search) | Full-text and vector search combined, over 41M+ entries. |
 | [Video search](/demos/video-search) | Natural-language search across a video library. |
+| [Large scale vector search (1.5B)](/demos/fineweb-edu-search) | Semantic search over 1.5B+ FineWeb EDU embeddings. |
+| [Robot data curation (DROID)](/demos/robot-data-curation) | Searching, scoring, and selecting robotics training examples. |

docs/web/demos/robot-data-curation.mdx

@@ -0,0 +1,21 @@
+---
+title: "Robot data curation (DROID)"
+sidebarTitle: "Robot Data Curation"
+description: "Search, score, and select robotics training examples from DROID."
+icon: robot
+---
+
+<Badge color="green">multimodal</Badge>
+<Badge color="yellow">robotics</Badge>
+<Badge color="purple">vector-search</Badge>
+<Badge color="gray">fts</Badge>
+
+<Card
+  title="Robot Data Curation (DROID)"
+  img="/static/assets/images/demos/droid_hero.jpg"
+  href="https://lancedb-demos.vercel.app/demo/robot-data-curation"
+>
+Search robot video frames from the DROID dataset, compute features, and select training examples in LanceDB.
+Add captions and quality scores as columns, then write model errors back to guide the next training run.
+
+</Card>

docs/web/docs.json

@@ -545,7 +545,9 @@
           "demos/index",
           "demos/semantic-art",
           "demos/wikipedia-search",
-          "demos/video-search"
+          "demos/video-search",
+          "demos/fineweb-edu-search",
+          "demos/robot-data-curation"
         ]
       }
     ]

docs/web/static/assets/images/demos/fineweb_edu_hero.svg

@@ -0,0 +1,61 @@
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