Fix mimetypes

src/embed.odin

@@ -510,11 +510,16 @@ detect_mime_type :: proc(url: string) -> string {
 		return "video/x-cpk"
 	case ".film":
 		return "video/x-film"
-
-	case "js", "javascript":
+	case ".js", ".javascript":
 		return "text/javascript"
-	case:
+	case ".json":
+		return "application/json"
+	case ".xml":
+		return "application/xml"
+	case ".html", ".htm":
 		return "text/html"
+	case:
+		return "application/octet-stream"
 	}
 }