"Fix" an annoying UI issue in the sidebar where if the content width does not fill the sidebar, the sidebar itself will not expand to the full screen on constrained displays (where our definition of constrained is the hamburger icon is visible on the navbar)

We "fix" this by inserting a paragraph into the sidebar that's long enough to ensure the sidebar goes full width, but make it not visible so the user won't actually see anything untoward unless they view the source themselves :)