Onboarding Modal Popup

On clicking a home page card `Keep Track of your Favorite Books` , `Read Free Library eBooks`, a modal window will appear.
Let's decide how will this modal popup look like!!

# Requirements:
- [ ] How will the modal window look like?
- [ ] Different cards for the modal popup.
- [ ] What text / copy / images do we use for each slide- [ ] One card at a time

# Ideas:
- Should we use the slick within our existing Colorbox (?) modal -- the popup which gets triggered when we view a Book Preview or View Bookcover on our books page?
- CodePen demo: [https://codepen.io/sabreen-parveen/pen/bGqPMwg](https://codepen.io/sabreen-parveen/pen/bGqPMwg)
- One card at a time
- Could use the sliders
- Bullets or progress indicator / how many cards there are? (v2)