panettone: Display before/after of updated issue bodies somewhere

Opened by grfn at 2021-05-23T12·37+00

cl/3142 made it so updated issue bodies don't get the before/after values displayed on the page (because it was frequently very long and used up a lot of space). It'd still be nice to display those somewhere, however, perhaps behind a <details>

  1. grfn updated the body of this issue at 2021-05-23T12·37+00