[demo] Create more demos

[ciampo]

• [x] basic usage
• [x] custom layout options (slides with different heights, setting the height of the carousel...)
• [x] adding pagination
• [x] adding navigation
• [x] custom prev/next
• [x] custom pagination
• [x] infinite loop
• [x] disabled pointer events (drag)
• [x] multiple slides per view
• [x] disable auto focus
• [x] reduced motion
• [x] consuming the selected event
• [x] add / remove slides
• [x] responsive: changing both CSS and properties