Bug#1151565: RFS: git-diff-html/1.1-1 -- generate side-by-side HTML diff reports for Git repositories

[luhaoran1981]

> 
> Hi Daniel,
> 
> Thanks for the review and for uploading it to NEW.
> 
> I'll handle the three notes in the next upload after NEW processing: bump 
> Standards-Version to 4.7.4, document the two-file compare in the man page, 
> and sync the salsa main branch with upstream/latest.
> 
> Best regards,
> Lu Haoran
>