Move along, there's nothing to see!

This patch includes all the minor stuff that I've overlooked when doing the release yesterday.

Added

• documentation on how to disable dark-mode (75eabdc, #54)
• documentation on how to configure the sidebar width for the sidebar-only theme variant. (75eabdc)

Changed

• reduced the default sidebar width for the sidebar-only theme variant to 335px. (7071e18)
• Text overflowing the sidebar-only title is now not wrapping to a new line and instead cut of. This is to make sure the layout below doesn't break. Choose your sidebar width wisely! (75eabdc)

Fixed

• the hover-effect on the mobile main menu's expand/collapse buttons wasn't... perfect. The coloring has been tweaked a bit to fix the appearance. (7c59e23)
• <hr> tags do now also expand beyond it's bounds on small screens (7c35531)