Stop hiding homepage from sidebar, and remove "go home" toolbar button
Part of teams/vdg/issues#51 (closed).
Per the HIG, when an app has a navigation control like a sidebar, the page that the app opens to should be visible in it.
We already do this in most KDE apps (including Into Center, which shares shell code) but System Settings was an odd exception. This commit remedies that, and removes a whole lot of now-unnecessary supporting code.
Info Center is unaffected.
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Edited by Nate Graham