metalad chapter contains large incomprehensible outputs

[mih]

Here is a demo:

https://handbook.datalad.org/en/latest/beyond_basics/101-181-metalad.html#download-metadata-from-a-remote-repository

There is more than one listing with large quantities of more-or-less extremely redundant output (meta-dump -r). Each of them yields 23!! pages of unformated JSON-lines output that serves no apparent educational value.

@christian-monch please take a look and improve things to a degree where the trade-off between educational value and consumed space becomes meaningful again.

Thanks!