Websites should look like websites, not mobile feeds

[DPS2004]

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I've noticed this trend in a lot of other sites, but unfortunately it seems to have hit GitHub too. The new feed is pointlessly centered, and doesn't take up the full space that a fullscreen browser gives it to work with. Why is there so much blank space on the side? Unlike others here I'm not entirely opposed to the new content of the feed (though a toggle for old/new style content would be very much appreciated), but the current design of it is abhorrent.