Added column sort filtering to SnippetList. #595
Description
A similar feature to column sort is currently provided in the content navigation bar.
In the image above, "Highest rated" and "Most bookmarked" correspond to that feature.
I believe that the content navigation bar should ultimately be removed.
Of course, the functionality it provides should still be offered in a different form.
First, I think it would be good to place features like column sort as follows.
Column sort will not support multiple selections (only one filter can be selected at a time),
and I think it would be good to implement it in the following way:
none → ascending → descending → none.