On API-doc page, side bar scrolling not working for "Executor"

[nickdgardner]

Issue Description

When I click on Executors on the API-doc page, the visible side bar scrolling under "On this page" shows "Digital Dynamical Decoupling" highlighted instead of "Executors". The main part of the page jumps to the Executors section as intended, just the side bar seems to be broken for Executors. For other sections it works fine.

How to Reproduce

Follow this link to Executors

Expected behavior

Under "On this page", "Executors" rather than "Digital Dynamical Coupling" should be highlighted.

---

Environment Context

Use the about() function to summarize information on operating system, python version and dependencies.

from mitiq import about
about()

Additional Python Environment Details (pip freeze or conda list):

Copy and paste the output of `pip freeze` or `conda list` here.