Provide "catchy" examples of use of dandi-cli in CLI within README.md

An idea came up within the scope https://github.com/dandi/dandi-cli/pull/1193#issuecomment-1408741208 by @waxlamp and @melster1010 and IMHO warrants "separate thinking" thus filing a new issue here.

The problem with "more detailed" examples is that they might get outdated even faster than output of `--help` so it might be important to have them scripted/tested. Here is a few approaches we used/I am aware of

- in https://github.com/ReproNim/containers , a code snippet in https://github.com/ReproNim/containers#a-typical-workflow is executed by CI https://github.com/ReproNim/containers/blob/master/.github/workflows/tests.yaml#L30 at least to gain some smoke testing
- in DataLad we recorded demos which we showed via https://asciinema.org/ . Similarish animated gif in https://github.com/duecredit/duecredit/#to-cite-the-modules-and-methods-you-are-using . In both cases, problem is that those snippets need to be tested! So we got half-way there -- we wrote (and extracted into separate repo: https://github.com/datalad/screencaster) helpers to "play out" "cast scripts". E.g. https://github.com/datalad/screencaster/blob/master/cast2asciinema could be ran on the cast script like those in https://github.com/datalad/datalad/tree/maint/docs/casts . Disclaimer: we haven't done that for years now since handbook.datalad.org folks generalized them I believe within their docs framework.

So I decided to try and running
```
SCREENCAST_HOME=/tmp/demo ./cast2asciinema ../datalad-maint/docs/casts/seamless_nested_repos.sh output.cast
```
gave me this cast: https://asciinema.org/a/cWrxRnQJlyQNLHg836qAwRbqA (I believe there was some way to turn them also into gifs)

So, if someone were to do some "catchy" interactive demos
- something like those casts could be used
- they could be re-played out (without asciinema - just https://github.com/datalad/screencaster/blob/master/cast2script and run it) on CI to ensure that code is not breaking them

smth like that.