Thoughts? (instead of a Developer Docs and User Docs tab)

Also, we can default to tabs open with this approach as its not as overwhelming.

Thoughts?

Currently, I'm not sure the toggle works:

1. It makes it hard to link to a specific state. For example, we should be able to easily link to docs.rilldata.com/<business-users>/getting-started.
2. It's possible to get into a seemingly broken state by navigating to the "Reference" page, then attempting to go to a "Business User" docs page:
   
3. Aesthetically, it feels a little off. As is, the weight of the "Developer" / "Business User" toggle makes it feel like you're on one page, then clicking "Docs" might lead you to another page. But that's not the case.

Here's a proposal:

• We have two tabs: "Developers" and "User Guide"
• We add a namespace for the docs on each of these pages: docs.rilldata.com/develop/... and docs.rilldata.com/guide/...
• We rename the Developer "Guides" to "Tutorials" to avoid the naming overlap
• Any content that is used on both pages gets placed in a common code directory, and we import it as a component into both Developer and User Guide pages. The file structure could be something like:

docs/
     developers/
       get-started/
       build/
       deploy/
       integrate/
     users/
       get-started/
       explore/
       manage/
     shared/
       overview.mdx
       concepts/
       feature-explanations/

Thoughts on that?