All revealjs examples

• background-color
• background-gradient
• background-no-title
• code-echo
• columns

• creating-slides-1
• creating-slides-2
• creating-slides-3
• executable-code-figure-size
• footer-and-logo

• image-background
• incremental-lists-1
• incremental-lists-2
• incremental-lists-3
• incremental-pause

• line-highlighting-1
• line-highlighting-2
• line-highlighting-3
• line-highlighting-4
• no-footer-on-a-slide

• per-slide-footer
• scrollable-and-smaller
• scrollable
• slide-with-speaker-notes
• smaller

• tabset