REGR/DOC: Docs left navbar broke
- [x] closes #48605 (Replace xxxx with the Github issue number)
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

cc @phofl 
Pages opens with side navigation collapsed:

![image](https://user-images.githubusercontent.com/45562402/190912623-167f45ea-1d3b-4bc2-b625-65d90c0f8d19.png)

And expands correctly

![image](https://user-images.githubusercontent.com/45562402/190912642-db22c62d-aa50-464c-87c0-25e5b29bfc77.png)

Might be nice to rework the Release notes to take advantage of this - grouping each minor version with drop downs - but certainly outside the scope here

![image](https://user-images.githubusercontent.com/45562402/190912685-5d6dccaa-eb13-4c59-a326-fbe1c1b3b5ae.png)
 Removing this removes some configuration options. Could you try my suggestion above locally? This works for me (e.g. removed the checkbox and added line breaks)

<img width="767" alt="image" src="https://user-images.githubusercontent.com/61934744/190913668-cdc282c0-0a6e-4ff6-85de-7166f4bb7248.png">
 Thx @rhshadrach  Thanks @phofl for the corrections here.