[Enhancement] Upgrade Guides and Samples for DLR

[Felix-Dynamsoft]

To improve the documentation of DLR, we should include upgrade guides, and samples

Current Label Recognition Page https://www.dynamsoft.com/label-recognition/docs/web/programming/javascript/
Reference: https://www.dynamsoft.com/barcode-reader/docs/web/programming/javascript/upgrade-guide/9to10.html

[Tom-Dynamsoft]

On hold -> to consider once we start working on a DCV-based all-in-one documentation