Add nested property to SidebarOptions

[Maschga]

Hi, 👋
First of all: Thank you very much for this plugin!

Description

I added a nested-property to the SidebarOptions-interface.

Motivation and Context

I use this plugin to document a Rest-API with OpenAPI. However, I use the auto-generate feature of Docusaurus to generate the sidebars since this documentation is toooooo big to add the sidebar-items manually. Therefore, I was not able to use the groupPathsBy-option. Because I couldn't find a workaround, but I really wanted to group the endpoints by their tag, I decided to implement the feature.

How Has This Been Tested?

I imported these changes locally in evcc-io/docs#698 and deployed them successfully and without errors. I was able to build and serve the project.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

Thank you very much in advance!
~Maschga

[Maschga]

I'm not able to fix this test even though the changes work as expected. Can somebody help me, please?