[BUG] cgit W3 validator fail

[Anast Gramm]

Hello. I recently got into some html "programming" and found out
about the w3 validator service https://validator.w3.org/

Upon running it on a cgit site I own an error occurred:

> The summary attribute on the table element is obsolete.
> Consider describing the structure of the table in a caption element
> or in a figure element containing the table; or, simplify the
> structure of the table so that no description is needed.

A quick grep through the code showed some lines containing the obsolete
html.

Should the summary attribute be moved into a caption or
should it be removed all together?
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