* Adds another notebook conversion
* Fix up some edge cases for handling links in notebooks. Notebooks
links were using a different convention than markdown links.
We'll need to push additional logic to use an appropriate suffix (.md or
.ipynb) for cross-references between how-to guides (though these should
be rare).
* Adds a conversion script from ipython notebook to markdown.
* Replaces one ipython notebook (create react agent) with a markdown file for testing.
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Co-authored-by: Ben Burns <803016+benjamincburns@users.noreply.github.com>
