The next and previous buttons at the bottom of the page seem to have stopped working

[mbartlett21]

Looking at recent changes, the only suspicious one was https://github.com/rust-lang/this-week-in-rust/commit/2749a86022447516e1bb225112e5ca3eff2558ce, which updated pelican from 3.5 to 4.7.1.

[mbartlett21]

CC @RussianCow, who added the buttons

CC #986