Subpage design for documentation

[enesadastec]

Hi everybody,

As ADASTEC, we are preparing how to use documents for open source slam implementations. Now our documents are ready to add as subpages to 'how-to-guides' section.

I forked documentation repository and already completed required changes. But before open a pull request, I want to be sure if the subpage structure is correct.

Is there a way to live-test my changes or can someone check the structure please?
Here is my repository.

[kenji-miyake]

@enesadastec I believe it's good to submit a PR and deploy a preview site there!
https://autowarefoundation.github.io/autoware-documentation/main/contributing/documentation-guidelines/#how-to-preview-your-modification