fix: Update category.ts to produce valid "aria-level" attributes #7033
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The Aria level system starts with 1, but the variable 'this.level_' is zero-indexed and starts with 0, so be aware of this discrepancy when working with the code.
The basics
npm run format
andnpm run lint
The details
Resolves
Fixes #7027
Proposed Changes
Increase aria-level to start with 1 instead of 0.
Behavior Before Change
The aria-level starts with 0.
Behavior After Change
The aria-level starts with 1.
Reason for Changes
There are no aria-level with 0.
Test Coverage
Documentation
Additional Information
Refs: #7027