no joke I think the single most effective effort-to-result change that The Tech Internet could make for usability is to move the github readme above the github file list
The problem i would have with that is that the file list generally shows not that many lines because the top level of most repos will have mostly just some subdirectories, while the Readme can get very long for some repos. That would mean a lot of scrolling to get to the file list in those repos.
Now if they made both the file list and the readme collapsible and maybe even start with the file list collapsed, then i think that would be a better solution.