Support monospaced font in tab title

[henryiii]

Is your feature request related to a problem? Please describe.

When adding this for packaging.python.org, it would have been have tab names like:

setup.cfg (dynamic) | setup.py (static)

However, it does not seem to support either of the forms of restructure text I tried (double-ticks or :file: + single ticks.

Describe the solution you'd like

 .. tab:: ``setup.py`` (dynamic)
 .. tab:: :file:`setup.py` (dynamic)

(one of the two, I'd think at least the first one) should work.

Describe alternatives you've considered

Don't have a workaround.

Additional context

Needed here: https://github.com/pypa/packaging.python.org/pull/818

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