Improve readability / IA structure of the issue page
the UI for issues and merge requests is atrocious with its light grey lines on a white background. I cannot skim a issue because I have to really concentrate on where a comment ends a new comment begins. Everything else also seems to float around in empty space, e.g. the emoji reactions. Give me solid black lines for orientation, dammit.
As noted in this comment, the issue (and MR page) contain an overwhelming amount of information. What structural improvements can we make to increase readability/scan-ability?