feat(convert): add support for Hexo sticky posts

- Map Hexo's 'sticky' property to Hugo's 'weight' parameter
- This enhancement allows for better conversion of Hexo posts to Hugo format

Author: pplmx

internal/convert.go

@@ -244,6 +244,7 @@ func getHexoToHugoKeyMap() map[string]string {
 		"permalink":   "slug",
 		"tags":        "tags",
 		"updated":     "lastmod",
+		"sticky":      "weight",
 	}
 }