[Docs] "Vanilla Three.js" tab disappears when other tabs selected

[jontonsoup4]

Description

On the uikit docs website, the "Vanilla Three.js" tab inside of the "GETTING STARTED" category disappears when selecting a few other tabs. The tabs that seem to effect the "Vanilla Three.js" tab are "Components and Properties" within the "GETTING STARTED" category, and the "Apfel" and "Default" tabs in the "KITS" category. All other tabs show the "Vanilla Three.js" tab as expected.

Steps to recreate

• Navigate to https://docs.pmnd.rs/uikit/getting-started/introduction
• Click "First Layout" tab
• This will show the "Vanilla Three.js" tab at the bottom of the "GETTING STARTED" category
• Now select "Components and Properties"
• The "Vanilla Three.js" tab will disappear
• Repeat with "Apfel" and "Default", as those hide the "Vanilla Three.js" tab as well

Screenshots

Expected

Actual