docs: add sphinx-tippy package dependency

[bjlittle]

🚀 Pull Request

Description

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.30%. Comparing base (ec2bb32) to head (ca8ea10).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #873 +/- ## ======================================= Coverage 91.30% 91.30% ======================================= Files 58 58 Lines 2934 2934 ======================================= Hits 2679 2679 Misses 255 255 ```

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