feat: allow to delete attachment

[gianpaj]

• I'm also limiting the file input to accept PNG or JPEG, as that's what the /upload route supports.

upload-and-delete-attachment-opt.mp4

The only reason why I'm opening it as a draft PR is that I can't figure out why negative classes are not working in Tailwind...
-right-2 -top-2
in the Delete icon button

        {onDelete && (
          <Button
            variant="outline"
            onClick={() => onDelete(attachment)}
            className="absolute -right-2 -top-2 rounded-full bg-background border p-0.5 hover:bg-muted size-6"
            //                  ^ why not working sir??
          >
            <X size={24} />
          </Button>
        )}

[vercel]

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