Shortcode for rendering code snippets from separate markdown files (#1548)

* shortcode for rendering code snippets from separate markdown files

* formatted code

* fix and readme

* semi-automatically extracts snippets from markdown

* extract snippets from points.md

* extract snippets from vectors.md

* extract snippets from payload.md

* extract snippets from search.md + fixes

* extract snippets from explore.md

* extract snippets from hybrid-queries.md + mode query by id into search

* extract snippets from filtering.md

* extract snippets from storage.md + update outdated info

* extract snippets from indexing.md

* extract snippets from snapshots.md

* extract snippets from guides/optimize.md

* extract snippets from guides/multiple-partitions.md + fix aside note

* extract snippets from guides/quantization.md

* use auto-generated descriptions

* order json snippets first

---------

Co-authored-by: generall <andrey@vasnetsov.com>

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/_description.md

@@ -0,0 +1 @@
+This code snippet demonstrates a feature to check if a collection exists by making a GET request to a specified endpoint that includes the collection name. This functionality is available starting from version 1.8.0.

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/bash.md

@@ -0,0 +1,3 @@
+```bash
+curl -X GET http://localhost:6333/collections/{collection_name}/exists
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/csharp.md

@@ -0,0 +1,3 @@
+```csharp
+await client.CollectionExistsAsync("{collection_name}");
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/go.md

@@ -0,0 +1,5 @@
+```go
+import "context"
+
+client.CollectionExists(context.Background(), "my_collection")
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/http.md

@@ -0,0 +1,3 @@
+```http
+GET http://localhost:6333/collections/{collection_name}/exists
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/java.md

@@ -0,0 +1,3 @@
+```java
+client.collectionExistsAsync("{collection_name}").get();
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/python.md

@@ -0,0 +1,3 @@
+```python
+client.collection_exists(collection_name="{collection_name}")
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/rust.md

@@ -0,0 +1,3 @@
+```rust
+client.collection_exists("{collection_name}").await?;
+```

qdrant-landing/content/documentation/headless/snippets/check-collection-exists/simple/typescript.md

@@ -0,0 +1,3 @@
+```typescript
+client.collectionExists("{collection_name}");
+```