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/collection-aliases/create/generated/bash.md

@@ -0,0 +1,14 @@
+```bash
+curl -X POST http://localhost:6333/collections/aliases \
+  -H 'Content-Type: application/json' \
+  --data-raw '{
+    "actions": [
+        {
+            "create_alias": {
+                "collection_name": "example_collection",
+                "alias_name": "production_collection"
+            }
+        }
+    ]
+}'
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/csharp.md

@@ -0,0 +1,3 @@
+```csharp
+await client.CreateAliasAsync(aliasName: "production_collection", collectionName: "example_collection");
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/go.md

@@ -0,0 +1,5 @@
+```go
+import "context"
+
+client.CreateAlias(context.Background(), "production_collection", "example_collection")
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/java.md

@@ -0,0 +1,3 @@
+```java
+client.createAliasAsync("production_collection", "example_collection").get();
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/python.md

@@ -0,0 +1,11 @@
+```python
+client.update_collection_aliases(
+    change_aliases_operations=[
+        models.CreateAliasOperation(
+            create_alias=models.CreateAlias(
+                collection_name="example_collection", alias_name="production_collection"
+            )
+        )
+    ]
+)
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/rust.md

@@ -0,0 +1,10 @@
+```rust
+use qdrant_client::qdrant::CreateAliasBuilder;
+
+client
+    .create_alias(CreateAliasBuilder::new(
+        "example_collection",
+        "production_collection",
+    ))
+    .await?;
+```

qdrant-landing/content/documentation/headless/snippets/collection-aliases/create/generated/typescript.md

@@ -0,0 +1,12 @@
+```typescript
+client.updateCollectionAliases({
+  actions: [
+    {
+      create_alias: {
+        collection_name: "example_collection",
+        alias_name: "production_collection",
+      },
+    },
+  ],
+});
+```