* link to online man-page
* rename: "N-R-K" -> "NRK"
* separate multiple links with a comma.
otherwise the links get messed up due to `[] []` being valid syntax for
reference style links with the 2nd `[]` serving as `id`.
* prefer codeberg links over github ones
Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/362
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>
32bfe58915