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/inference/jinaai-upsert/go.go

@@ -0,0 +1,34 @@
+package snippet
+
+import (
+	"context"
+	"time"
+
+	"github.com/qdrant/go-client/qdrant"
+)
+
+func Main() {
+	client, err := qdrant.NewClient(&qdrant.Config{
+		Host:   "xyz-example.qdrant.io",
+		Port:   6334,
+		APIKey: "<paste-your-api-key-here>",
+		UseTLS: true,
+	})
+
+	client.Upsert(ctx, &qdrant.UpsertPoints{
+		CollectionName: "{collection_name}",
+		Points: []*qdrant.PointStruct{
+			{
+				Id: qdrant.NewIDNum(uint64(1)),
+				Vectors: qdrant.NewVectorsImage(&qdrant.Image{
+					Model: "jinaai/jina-clip-v2",
+					Image: qdrant.NewValueString("https://qdrant.tech/example.png"),
+					Options: qdrant.NewValueMap(map[string]any{
+						"jina-api-key": "<YOUR_JINAAI_API_KEY>",
+						"dimensions":   512,
+					}),
+				}),
+			},
+		},
+	})
+}