Replace help icon with ? to avoid conflict with the new about section

Signed-off-by: Julius Härtl <jus@bitgrid.net>

settings/img/help.svg

@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" version="1.1" viewbox="0 0 16 16" width="16" height="16"><path d="M5 7.474c.155.382.325.69.644.246.407-.268 1.76-1.427 1.662-.342-.368 2.017-.834 4.017-1.17 6.04-.393 1.114.634 2.067 1.637 1.31 1.078-.502 1.99-1.287 2.927-2.01-.144-.323-.25-.79-.596-.347-.468.24-1.47 1.318-1.696.472.315-2.18.975-4.295 1.365-6.462.397-1.005-.364-2.223-1.4-1.363C7.117 5.634 6.083 6.6 5 7.474zM9.46.005C8.15-.017 7.553 2.147 8.815 2.68c1.023.378 2.077-.714 1.79-1.75-.098-.542-.598-.97-1.147-.93z"/></svg>
+<svg xmlns="http://www.w3.org/2000/svg" height="16" width="16"><path d="M6.508 10.106v-.642q0-.833.356-1.449.356-.616 1.302-1.31.91-.65 1.197-1.059.295-.408.295-.91 0-.565-.416-.86-.417-.295-1.163-.295-1.302 0-2.968.85l-.945-1.9Q6.1 1.447 8.27 1.447q1.787 0 2.837.859 1.059.859 1.059 2.29 0 .955-.434 1.649-.434.694-1.649 1.562-.833.616-1.058.937-.217.32-.217.842v.52zm-.277 2.968q0-.73.39-1.102.39-.373 1.137-.373.72 0 1.11.381.4.382.4 1.094 0 .685-.4 1.084-.399.39-1.11.39-.729 0-1.128-.381-.4-.39-.4-1.093z"/></svg>