Remove mmistakes
This MR removes the navigation based on minimal-mistakes (i.e. reverts 491aabb4) and uses the simple sidebar bootstrap template instead (see https://startbootstrap.com/template/simple-sidebar)
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This MR removes the navigation based on minimal-mistakes (i.e. reverts 491aabb4) and uses the simple sidebar bootstrap template instead (see https://startbootstrap.com/template/simple-sidebar)