[FX-4406] Update docsy theme to v0.9.0

[TaylorBriggs]

Changelog

This version of the docsy theme should contain some fixes for the sidebar nav.

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Variables

Help us support a “Write once, publish everywhere” single source of truth. If you see a line that looks like:

{{% asset-categories %}}

You’ve found a shortcode that we include in multiple documents.

You’ll find the content of the shortcode in the following directory:

https://github.com/cobalthq/cobalt-product-public-docs/tree/main/layouts/shortcodes

That shortcode has the same base name as what you see in the PR, such as asset-categories.html.

Checklist for PR Author

[ ] Did you check for broken links and alt text?

Be sure to check for broken links and Alt Text issues. We have a partially automated process,
as described in this section of our repository README:
Test Links and Alt Attributes.

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