This commit uses the Markdown extension defined in
zerver/lib/bugdown/api_generate_examples to generate the
example fixture and code example, so that both are tested
in tools/lib/api_tests.
It makes sense to make our Python and JS API examples more visible
than our curl examples, since Python is what most people will tend
to use.
Also, from a design perspective, an API documentation page that
starts off with a shiny Python example with syntax highlighting
looked much better than having a bland curl example be the first
thing readers see.
Eeshan Garg