Fix aria-level and aria role violations #198
Merged
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This tree component has accessibility violations caught by Axe, and this PR addresses the violation for aria role and aria-level.
The row component has a role "treeitem", which requires a parent component with role "tree".
Also, aria-levels must be greater than or equal to 1, and since the root node starts at 0, this was causing another accessibility violation
Fixes #197