Support mkdocstrings-python 2.0

[analog-cbarber]

Not sure what is involved other than changing the upper limit on the version. Don't know if we use any deprecated apis...

[analog-cbarber]

Needed for #52

[analog-cbarber]

This also includes changes to mkdocstrings 1.0 from 0.30.

See: https://github.com/mkdocstrings/mkdocstrings/releases/tag/1.0.0

[analog-cbarber]

Fixed in version 2.0