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/snapshots/delete-full-snapshot/generated/csharp.md

@@ -0,0 +1,7 @@
+```csharp
+using Qdrant.Client;
+
+var client = new QdrantClient("localhost", 6334);
+
+await client.DeleteFullSnapshotAsync("{snapshot_name}");
+```

qdrant-landing/content/documentation/headless/snippets/snapshots/delete-full-snapshot/generated/go.md

@@ -0,0 +1,14 @@
+```go
+import (
+	"context"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+client, err := qdrant.NewClient(&qdrant.Config{
+	Host: "localhost",
+	Port: 6334,
+})
+
+client.DeleteFullSnapshot(context.Background(), "{snapshot_name}")
+```

qdrant-landing/content/documentation/headless/snippets/snapshots/delete-full-snapshot/generated/java.md

@@ -0,0 +1,9 @@
+```java
+import io.qdrant.client.QdrantClient;
+import io.qdrant.client.QdrantGrpcClient;
+
+QdrantClient client =
+    new QdrantClient(QdrantGrpcClient.newBuilder("localhost", 6334, false).build());
+
+client.deleteFullSnapshotAsync("{snapshot_name}").get();
+```

qdrant-landing/content/documentation/headless/snippets/snapshots/delete-full-snapshot/generated/python.md

@@ -0,0 +1,7 @@
+```python
+from qdrant_client import QdrantClient
+
+client = QdrantClient(url="http://localhost:6333")
+
+client.delete_full_snapshot(snapshot_name="{snapshot_name}")
+```

qdrant-landing/content/documentation/headless/snippets/snapshots/delete-full-snapshot/generated/rust.md

@@ -0,0 +1,7 @@
+```rust
+use qdrant_client::Qdrant;
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+client.delete_full_snapshot("{snapshot_name}").await?;
+```

qdrant-landing/content/documentation/headless/snippets/snapshots/delete-full-snapshot/generated/typescript.md

@@ -0,0 +1,7 @@
+```typescript
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.deleteFullSnapshot("{snapshot_name}");
+```