Automated snippet conversion by scripts

These changes are purely mechanical to differentiate them from manual
fixes/adjustments made in the next commit.
This results in broken code as some snippets contain errors.

Made in four steps:
1. Run ./migrate-snippet.py that converts `.md` files to code files
   and perhaps adds missing lines under `// @hide` comments.
2. Sort Java imports.
3. Remove old `.md` files.
4. Run ./generate.md to produce `*/generated/*.md` files.

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/csharp.md

@@ -0,0 +1,18 @@
+```csharp
+using Qdrant.Client;
+using Qdrant.Client.Grpc;
+
+var client = new QdrantClient("localhost", 6334);
+
+await client.QueryAsync(
+  collectionName: "{collection_name}",
+  prefetch: new List<PrefetchQuery>
+  {
+	  // 2+ prefetches here
+  },
+  query: new Rrf
+  {
+	  K = 60,
+  }
+);
+```

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/go.md

@@ -0,0 +1,23 @@
+```go
+import (
+	"context"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+client, err := qdrant.NewClient(&qdrant.Config{
+	Host: "localhost",
+	Port: 6334,
+})
+
+client.Query(context.Background(), &qdrant.QueryPoints{
+	CollectionName: "{collection_name}",
+	Prefetch:       []*qdrant.PrefetchQuery{
+		// 2+ prefetches here
+	},
+	Query: qdrant.NewQueryRRF(
+		&qdrant.Rrf{
+			K: qdrant.PtrOf(uint32(60)),
+		}),
+})
+```

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/java.md

@@ -0,0 +1,22 @@
+```java
+import static io.qdrant.client.QueryFactory.rrf;
+
+import io.qdrant.client.QdrantClient;
+import io.qdrant.client.QdrantGrpcClient;
+import io.qdrant.client.grpc.Points.PrefetchQuery;
+import io.qdrant.client.grpc.Points.QueryPoints;
+import io.qdrant.client.grpc.Points.Rrf;
+import java.util.List;
+
+QdrantClient client = new QdrantClient(QdrantGrpcClient.newBuilder("localhost", 6334, false).build());
+
+client
+    .queryAsync(
+        QueryPoints.newBuilder()
+            .setCollectionName("{collection_name}")
+            // .addPrefetch(...) <┐
+            // .addPrefetch(...) <┴─ 2+ prefetches here
+            .setQuery(rrf(Rrf.newBuilder().setK(60).build()))
+            .build())
+    .get();
+```

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/python.md

@@ -0,0 +1,13 @@
+```python
+from qdrant_client import QdrantClient, models
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.query_points(
+    collection_name="{collection_name}",
+    prefetch=[
+        # 2+ prefetches here
+    ],
+    query=models.RrfQuery(rrf=models.Rrf(k=60)),
+)
+```

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/rust.md

@@ -0,0 +1,13 @@
+```rust
+use qdrant_client::Qdrant;
+use qdrant_client::qdrant::{Rrf, PrefetchQueryBuilder, Query, QueryPointsBuilder};
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+client.query(
+    QueryPointsBuilder::new("{collection_name}")
+        // .add_prefetch(...)  <┐
+        // .add_prefetch(...)  <┴─ 2+ prefetches here
+        .query(Query::new_rrf(RrfBuilder::with_k(60))
+).await?;
+```

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-rrf-k/generated/typescript.md

@@ -0,0 +1,12 @@
+```typescript
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.query("{collection_name}", {
+    prefetch: [
+      // 2+ prefetches here
+    ],
+    query: { rrf: { k: 60 } },
+});
+```