UX: make category topic counts clickable on mobile (PR #10541)

https://meta.discourse.org/t/total-number-of-topics-in-categorys-view-field-should-be-clickable-to-open-that-category/161901

Minor HTML changes.

GitHub

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https://meta.discourse.org/t/total-number-of-topics-in-categorys-view-field-should-be-clickable-to-open-that-category/161901/5