Our docs currently use he taglist extension, which is an archived / unmaintained project (https://github.com/spinus/sphinxcontrib-taglist), and was the cause of the warning of CDRIVER-3594:

AFAICT, the taglist extension is only used to generate some of the "See Also"
links on pages, like this one:
http://mongoc.org/libmongoc/current/mongoc_uri_get_auth_mechanism.html#taglist
generated from:
https://github.com/mongodb/mongo-c-driver/blob/1.16.0/src/libmongoc/doc/mongo...

If that's all it's used for, let's remove it. From some quick searching I
did not see a quick replacement for taglists. But we could do something simpler.
Replace the lists of links with an include file:

```
.. taglist:: See Also:
:tags: authmechanism
```

Becomes:

```
.. include:: includes/seealso/authmechanism.txt
```

And that file can just have a plain old list.