v1.6.1

Fix: Slides header, TOC lists, highlight wrapper

• Add header section with title, date, author and description to slides.
• Remove bottom margin for lists in table of contents (TOC). This is
  done to prevent empty space between list items when there are multiple
  levels in table of contents (TOC).
• Reuse highlight wrapper. This change enables reusing highlight wrapper
  for components without the toolbar and copy buttons e.g. slides.