Cleanup doc site warnings, add types, etc.

[brandongregoryscott]

Overview

The doc site has had a huge number of warnings for unexpected any and non-null assertions for a while. Most of these were on the name property for the generic Item in our information architecture object, which is always present. I've updated the type and removed a bunch of assertions/casts. There are some other type changes in #1611 that should almost completely resolve the build warnings.

Nothing should functionally change here, just some code cleanup/logic consolidation.

Screenshots (if applicable)

Documentation

• [ ] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [ ] Added / modified Storybook stories

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