Convert Category images layout to css

[michael_s]

This is a very small edit for anyone who is interested.

I have converted a tiny section of the default 2.3.2 code in the index.php file

so that categories are now outputted in a css unordered list with some div tags inside rather than the table format.
Its not a major change, but should be simple to style with the css and a good base to build from.

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