Switch to zxing-js for QrCodes

[nodh]

I've missed, that there is a ZXing Library for JS/TS: https://github.com/zxing-js/library

That one should be used instead of our current one for the JS target. Then, hopefully, encoding and decoding will work.

[JesusMcCloud]

ZXing does not work well with our pipeline. Also, it's really large and we only need a fraction of its functionality.
Something smaller and simpler would be a better fit.