Add section title to top of left nav/sidebar to help orient user

[jhaaaa]

Add section title/doc instance name to top of left nav/sidebar for the following sections:

• Client SDK
• Dev concepts
• Community
• Vision

This will help orient the user on the site. For example, I select Documentation > Development concepts from the top nav/nav bar. I land on the Introduction to XMTP page, however there is no indication that I am in the Development concepts section of the site. We need to be able to show this information to the user.

Here is a ROUGH wireframe of what I'm talking about:

Alternatively, it looks like Docusaurus is very close to adding the ability to add the doc instance title to the breadcrumb! facebook/docusaurus#6953

Do we think it is enough to provide this in the breadcrumb and therefore we don't need to add this title to the left nav/sidevbar? Or do we want to provide both?

[jhaaaa]

J-Ha and @darickdang discussed today and agree a solution is needed. Darick is going to take a look and think about how we might address this.

[jhaaaa]

Also need to think about how to display this info on mobile. Maybe not necessary?

[jhaaaa]

Obsolete