fix: uses category as map key

[DiogoSoaress]

Uses category as map key.
href is undefined for the buttons with submenus.

[github-actions]

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https://fix_key_warning--homepage.review.5afe.dev

[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}